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: Gynaecology & Obstetrics
[{'content': 'Most common site for extra-pelvic endometriosis \nSelect and explain. \nA. Rectum, B. Sigmoid colon, C. Duodenum, D. Jejunum', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Most common site for extra-pelvic endometriosis is gastro-intestinal system i.e.,\xa0sigmoid colon> Rectum.', 'role': 'assistant'}]