This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vitamins and Minerals, Subject name: Biochemistry
Which vitamin deficiency causes pellagra? 
Select and explain. 
A. Vitamin B1, B. Vitamin B2, C. Vitamin B3, D. Vitamin B4
C: Vitamin B3
Answer: C: Vitamin B3 
Explanation: Ans. is 'c' i.e., Vitamin B3* Pellagra characterised by the three Ds - Diarrhoea, Dermatitis and Dementia is caused by niacin or vitamin B3 deficiency.