This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
[{'content': 'Pellagra is caused by deficiency of which vitamin? \nSelect and explain. \nA. B2, B. B3, C. B1, D. Folic acid', 'role': 'user'}, {'content': "Answer: B \nExplanation: Niacin (Vit B3) or nicotinic acid is also known as pellagra preventive (P.P.) factor of Goldberg Pellagra Photosensitive Dermatitis: Symmetric dermatitis in the sun-exposed areas Casal's Necklace The rash form a ring around the neck 4 Ds of Pellagra Dermatitis (Photosensitive Dermatitis) Dementia Diarrhoea Death ref DM Vasudevan 8th ed page 470", 'role': 'assistant'}]