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: Surgery
[{'content': 'Minimum daily intake of iodide is: \nSelect and explain. \nA. 20 microgram., B. 40 microgram., C. 60 microgram., D. 80 microgram.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]