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
Cancellous bone graft taken from: 
Select and explain. 
A. Femoral condyles, B. Pelvis, C. Greater trochanter, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: A i.e. Femoral condyle; B i.e. Pelvis C i.e. Greater trochanter