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': 'The femur is fractured at bih at \nSelect and explain. \nA. Upper third of shaft, B. Middle third of shaft, C. Lower third of shaft, D. Neck region', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Upper third of shaft', 'role': 'assistant'}]