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
[{'content': 'Which vitamin deficiency causes pellagra? \nSelect and explain. \nA. Vitamin B1, B. Vitamin B2, C. Vitamin B3, D. Vitamin B4', 'role': 'user'}, {'content': "Answer: C \nExplanation: 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.", 'role': 'assistant'}]