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
Sliding constituent of a large direct hernia is : 
Select and explain. 
A. Bladder, B. Sigmoid colon, C. Caecum, D. Appendix
A: Bladder
Answer: A: Bladder 
Explanation: Sigmoid colon and Caecum slide into indirect sac not in direct sac.