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: Orthopaedics
Standard site for primary bone graft -a) Pelvisb) Greater trochanterc) Medial malleolusd) Lateral melleoluse) Fibula 
Select and explain. 
A. a, B. b, C. ab, D. ae
D: ae
Answer: D: ae 
Explanation: Standard site for primary cancellous bone graft → Iliac crest of pelvis.
Standard site for primary cortical bone graft → fibula.