This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
[{'content': 'Maize is deficient in which amino acid \nSelect and explain. \nA. Leucine, B. Methionine, C. Tryptophan, D. Phenylalanine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The proteins of maize are deficient in tryptophan and lysine; while some strains contain an excess of leucine. Excess of leucine or deficiency of tryptophan causes decreased synthesis of niacin in the body. This explains the pellagragenic action of maize.', 'role': 'assistant'}]