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: Medicine
[{'content': 'Fish is a pure source of : \nSelect and explain. \nA. Vitamin A, B. Proteins, C. Iron, D. Iodine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fish is a pure source of\xa0Iodine and Carbohydrates.', 'role': 'assistant'}]