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': 'What is the most appropriate operation for a solitary nodule in one lobe of thyroid - \nSelect and explain. \nA. Lobectomy, B. Hemithyroidectomy, C. Nodule removal, D. Partial lobectectomy with 1 cm margin around nodule.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]