Match List-I with List-II.

	List-I (Name of Vitamin)		List-II (Deficiency disease)
A.	Vitamin B12	I.	Cheilosis
B.	Vitamin D	II.	Convulsions
C.	Vitamin B2	III.	Rickets
D.	Vitamin B6	IV.	Pernicious anaemia

Choose the correct answer from the options given below:

To solve the matching problem we first recall the characteristic deficiency disease associated with each vitamin.

Vitamin B₁₂ (A): A lack of Vitamin B12 impairs DNA synthesis in red‑blood‑cell precursors, producing megaloblastic anemia that is classically called pernicious anaemia. Hence A matches with IV.

Vitamin D (B): Vitamin D is essential for calcium absorption and bone mineralisation. Its deficiency in children leads to soft, weak bones known as rickets. Therefore B matches with III.

Vitamin B₂ (C): Deficiency of Riboflavin (Vitamin B2) presents with **cheilosis** – cracking and inflammation of the corners of the mouth. Thus C matches with I.

Vitamin B₆ (D): Vitamin B6 is a co‑factor in the synthesis of neurotransmitters such as GABA. Its deficiency can cause neurological excitability, manifesting as convulsions. Consequently D matches with II.

Putting the matches together we obtain the ordered set:

A → IV,  B → III,  C → I,  D → II