This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hernia, Subject name: Surgery
[{'content': 'Viscera forms wall of which hernia? \nSelect and explain. \nA. Lumbar hernia, B. Sliding hernia, C. Epigastric hernia, D. Femoral hernia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Sliding hernia* Posterior wall of the sliding hernia is not only formed by sac but also by retroperitoneal structures.* MC structure being Sigmoid colon* Barium Enema is the preferred investigation to confirm the presence of Sigmoid Colon in Scrotum. (IOC for confirming Sliding hernia)', 'role': 'assistant'}]