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
Pellegra deficiency of ? 
Select and explain. 
A. Niacin, B. Thiamine, C. Riboflavin, D. Folate
A: Niacin
Answer: A: Niacin 
Explanation: Ans. is 'a' i.e., Niacin Beri-beri Deficiency of thiamine (Vit B1) Can be dry (neural involvement) Wet (cardiac involvent) Acute Pellagra Niacin (Vit B3) def. Dermatitis Diarrhea Dementia