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': "Which one of the following is not a feature of Klinefelter's syndrome \nSelect and explain. \nA. Gynecomastia, B. Eunuchoid, C. Short 4th metacarpal, D. Hypogonadism", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Short 4th metacarpal is a feature of Turner syndrome.', 'role': 'assistant'}]