If a five-letter meaningful word can be formed using the 1st, 3rd, 4th, 5th, and 11th letters from the left end of the word “CHAIRPERSON”, then which of the following will be the third letter of that word from the left end? If no meaningful word can be formed, mark 'X' as your answer. If more than one meaningful word can be formed, mark 'Z' as your answer.

The correct answer is I.

To solve this problem, let's list the positions of all letters in the word "CHAIRPERSON":
1st letter = C
2nd letter = H
3rd letter = A
4th letter = I
5th letter = R
6th letter = P
7th letter = E
8th letter = R
9th letter = S
10th letter = O
11th letter = N

Now, extract the specified letters from the left end:
- 1st letter: C
- 3rd letter: A
- 4th letter: I
- 5th letter: R
- 11th letter: N

The set of extracted letters is C, A, I, R, N.

Using these five letters, we can form the meaningful five-letter word CAIRN (meaning a mound of stones built as a landmark or memorial).

Determining the 3rd letter from the left end of the word "CAIRN":
- 1st letter: C
- 2nd letter: A
- 3rd letter: I
- 4th letter: R
- 5th letter: N

Therefore, the third letter of the formed word from the left end is I.