This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Maize is pellagragenic due to excess content of \nSelect and explain. \nA. Lysine, B. Threonine, C. Leucine, D. Tryptophan', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Amino acid imbalance caused by an excess of leucine is the cause of pellagra in maize (also jowar), eaters.Excess of leucine appears to interfere in the conversion of tryptophan to niacin.Park 23e pg: 619', 'role': 'assistant'}]