This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pelvis and Hip injuries, Subject name: Orthopaedics
All of the following areas are commonly involved sites in pelvic fracture except 
Select and explain. 
A. Pubic rami, B. Alae of ilium, C. Acetabulum, D. Ischial tuberosities
D: Ischial tuberosities
Answer: D: Ischial tuberosities 
Explanation: ref : maheswari 9th ed