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: Social & Preventive Medicine
[{'content': 'Lysine is deficient in: \nSelect and explain. \nA. Maize, B. Wheat, C. Fish, D. Egg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Maize', 'role': 'assistant'}]