This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Anti infective vitamin is – 
Select and explain. 
A. Vitamin B6, B. Vitamin A, C. Vitamin D, D. Vitamin C
B: Vitamin A
Answer: B: Vitamin A 
Explanation: Functions of Vit A

Vitamin A is essential for -
	I.Normal vision


Retinol is necessory for functioning of retina.
Regeneration of rhodopsin during dark light is vit A dependent --> vit A deficiency causes defective dark adaptation.

2. Anti-infective

Vitamin A is necessary for integrity of epithelial tissues that resist invasion by pathogens.
Vitamin A has some role in immune response.

3. Anticancer effect

Beta-carotene has antioxidant property —> by virtue of this action it reduces the incidence of lung, breast, oral, esophageal and bladder cancers.

4. Skeletal - growth

Vitamin A supports skeletal growth.