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': 'Cancellous bone graft taken from: \nSelect and explain. \nA. Femoral condyles, B. Pelvis, C. Greater trochanter, D. All of the above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Femoral condyle; B i.e. Pelvis C i.e. Greater trochanter', 'role': 'assistant'}]