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': 'Richest source of iodine - \nSelect and explain. \nA. Sea food, B. Milk, C. Meat, D. Butter', 'role': 'user'}, {'content': "Answer: A \nExplanation: The best source of iodine are sea foods and Cod liver oil. Smaller amount may occur in meat, milk, vegetable. REF. PARK'S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 624", 'role': 'assistant'}]