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: Biochemistry
[{'content': 'Dementia, dermatitis, diarrhoea are features of \nSelect and explain. \nA. Bed Bed, B. Pellagra, C. Vitamin B12 deficiency, D. Pyridoxine deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Deficiency of niacin causes pellagra, a disease involving the skin, gastrointestinal tract, and CNS.\xa0\nThe symptoms of pellagra progress through the three Ds: dermatitis (photosensitive), diarrhea, and dementia. If untreated, death (a fourth D) occurs.\xa0\nHartnup disorder, characterized by defective absorption of tryptophan, can result in pellagra-like symptoms.\n\nRef : Lippincott’s illustrated reviews for biochemistry , 7th edition.', 'role': 'assistant'}]