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': 'Sliding constituent of a large direct hernia is : \nSelect and explain. \nA. Bladder, B. Sigmoid colon, C. Caecum, D. Appendix', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sigmoid colon and Caecum slide into indirect sac not in direct sac.', 'role': 'assistant'}]