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': 'All of the following areas are commonly involved sites in pelvic fracture except: \nSelect and explain. \nA. Pubic rami, B. Alae of ileum, C. Acetabula, D. Ischial tuberosities', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fracture of the ischial tuberosity is uncommon injury. Ref: Skeletal Radiology - Volume 30, March 2001; Examination of Musculoskeletal Injuries eBook w/Web Resource By Sandra Shultz, Peggy Houglum, David Perrin, 3rd Edition, Page 495', 'role': 'assistant'}]