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': 'Maximum iron is in which nut? \nSelect and explain. \nA. Pista, B. Cashew, C. Peanut, D. Walnut', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) PistaRef: Park 22nded p 583', 'role': 'assistant'}]