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': 'Autologous bone graft is commonly taken from: \nSelect and explain. \nA. Iliac crest, B. Tibial tuberosity, C. Greater trochanter, D. Fibula', 'role': 'user'}, {'content': "Answer: A \nExplanation: Iliac crests are the commonest site for Autogenous bone grafts. Ref: Campbell's Operative Ohopaedics, 11th Edition, Pages 16-20; Essential Ohopedics By J Maheswari, 3rd Edition, Page 70; Rockwood and Green's Fractures in Adults, Volume 2, 7th Edition, Chapter 5, Page 105; Surgical Exposures In Ohopaedics: The Anatomic Approach, Stanley Hoppenfeld, 4th Edition, Chapter 7, Page 361", 'role': 'assistant'}]