This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
Which vitamin deficiency results in diarrhoea and renal stone formation : 
Select and explain. 
A. Vitamin A, B. Vitamin D, C. Vitamin C, D. Vitamin K
A: Vitamin A
Answer: A: Vitamin A 
Explanation: Vitamin A deficiency can result from inadequate intake, fat malabsorption, or liver disorders. Deficiency impairs immunity and hematopoiesis and causes rashes and typical ocular effects (eg, xerophthalmia, night blindness). Reference: GHAI Essential pediatrics, 8th edition