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': 'Commonest site of intro peritoneal abscess is \nSelect and explain. \nA. Lesser sac, B. Greater sac, C. Pelvis, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pelvic abscess in the most common site of intra peritoneal abscess.', 'role': 'assistant'}]