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': 'Surgical approaches for open thymectomy include all except \nSelect and explain. \nA. Transcervical thymectomy, B. Median sternotomy, C. Thoraco abdominal incision, D. Partial median sternotomy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]