This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Jowar is pellogerogenic due to excess of - \nSelect and explain. \nA. Leucine, B. Lysine, C. Tryptophan, D. Methionine', 'role': 'user'}, {'content': "Answer: A \nExplanation: - niacin deficiency results in pellagra. The disease is characterized by diarrhea, dermatitis and dementia. - niacin deficiency is common in jowar eating population due to aminoacid imbalance cause by an excess of leucine. - excess of leucine appears to interfere in the conversion of tryptophan to niacin. Reference: Park's textbook of preventive and social medicine, 23rd edition, pg no:619 <\\p>", 'role': 'assistant'}]