Read the given information carefully and answer the questions that follow:

Eight professionals—A, B, C, D, E, F, G, and H—hold different positions in an organization: Intern, Analyst, Specialist, Manager, Director, VP, SVP, and CEO, listed in increasing order of seniority where Intern is the lowest rank and CEO is the highest rank. Each person works in a different department: IT, Finance, HR, Legal, Sales, Marketing, Audit, and R&D, though not necessarily in the same order.

Exactly three persons are senior to A. The person who works in HR is two posts junior to A. Three designations exist between the person who works in HR and F. G is immediately senior to the person who works in Legal, but is junior to A. H is senior to G but junior to F, and does not work in HR. The number of persons senior to H is equal to the number of persons junior to the one who works in IT. E is three posts senior to C. The person who works in Finance is immediately senior to B. The person who works in Sales is two posts senior to E. H does not work in R&D, and the person who works in Marketing is senior to the person who works in Audit.

Who among the following works in the Audit department?

The correct answer is H.

Step 1: Understand the Designations and Seniority Order
There are 8 positions listed in increasing order of seniority from lowest (1) to highest (8):
1. Intern
2. Analyst
3. Specialist
4. Manager
5. Director
6. VP
7. SVP
8. CEO

Step 2: Determine the Position of A and HR
- Exactly three persons are senior to A. Thus, A must hold the 5th position (Director), as positions 6 (VP), 7 (SVP), and 8 (CEO) are senior to A.
- The person who works in HR is two posts junior to A (Position 5).
Position of HR = 5 - 2 = 3 (Specialist).

Step 3: Determine the Position of F
- Three designations exist between HR (Position 3) and F.
Going higher by 3 intermediate designations (positions 4, 5, and 6), F must be at Position 7 (SVP).

Step 4: Determine the Positions of H, G, Legal, and IT
- G is junior to A (Position 5) and immediately senior to Legal. Thus, Legal is at position Rank(G) - 1.
- H is senior to G but junior to F (Position 7), and does not work in HR (Position 3).
- The number of persons senior to H equals the number of persons junior to IT.
Let's evaluate the possible positions for H:
- If H were at Position 6 (VP), 2 persons would be senior to H. This would mean 2 persons are junior to IT, making IT Position 3 (Specialist). But Position 3 is already HR. So H cannot be Position 6.
- If H is at Position 4 (Manager), 4 persons are senior to H. Thus, 4 persons must be junior to IT, placing IT at Position 5 (Director, which is A). This is valid.
Since H = Position 4 (Manager), G must be at Position 2 (Analyst) because G < H and G cannot be Position 1.
Therefore, the Legal department is at Position 1 (Intern, 2 - 1 = 1).

Step 5: Determine the Positions of C, E, B, D, and Finance
- E is three posts senior to C (Position of E = Position of C + 3).
The remaining open person positions are 8, 6, 3, and 1. Thus, C must be at Position 3 (Specialist) and E must be at Position 6 (VP).
- The person working in Finance is immediately senior to B. Since B cannot be Position 8 (CEO), B must be at Position 1 (Intern).
Thus, Finance is at Position 2 (Analyst, filled by G).
- The remaining person D takes Position 8 (CEO).

Step 6: Determine the Department for H
- The person in Sales is two posts senior to E (Position 6). Thus, Sales is at Position 8 (CEO, filled by D).
- The remaining unassigned positions for departments are Position 7 (SVP, F), Position 6 (VP, E), and Position 4 (Manager, H).
- The remaining unassigned departments are Marketing, Audit, and R&D.
- We are given that H does not work in R&D, and the person who works in Marketing is senior to the person who works in Audit.
Since H is at Position 4 (the lowest among the three remaining positions), H cannot be Marketing (which must be senior to Audit) and H cannot be R&D. Therefore, H must work in the Audit department.

Hence, H works in the Audit department.