This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Pediatrics
[{'content': 'The triad of &;diarrhea, dementia, and dermatitis&; is characteristically seen in the deficiency of vitamin _______________ \nSelect and explain. \nA. Riboflavin, B. Niacin, C. Thiamine, D. Pyridoxine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Niacin deficiency results in pellagra.The early symptoms are vague. Anorexia, lassitude, weakness, burning sensations numbness and dizziness may be prodromal symptoms, After a long period of deficiency, the classic triad of dermatitis, diarrhea and dementia appears. Ref: Page 182; Nelson textbook of pediatrics; 17th edition', 'role': 'assistant'}]