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
[{'content': 'Abdominal Aoic Aneurysm most commonly ruptures in \nSelect and explain. \nA. Retroperitoneum, B. Pelvic cavity, C. Peritoneal cavity, D. Sub hepatic space', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Abdominal aoic aneurysm - anterior(20%) Posterior (80%) Most common site- retroperitonium with formation if retroperitonial hematoma. Reference- SRB, 5th edition, page:200', 'role': 'assistant'}]