This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
Abdominal Aoic Aneurysm most commonly ruptures in 
Select and explain. 
A. Retroperitoneum, B. Pelvic cavity, C. Peritoneal cavity, D. Sub hepatic space
A: Retroperitoneum
Answer: A: Retroperitoneum 
Explanation: Abdominal aoic aneurysm - anterior(20%) Posterior (80%) Most common site- retroperitonium with formation if retroperitonial hematoma. Reference- SRB, 5th edition, page:200