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': 'Viscera forms wall of which henna \nSelect and explain. \nA. Lumbar hernia, B. Sliding hernia, C. Epigastric hernia, D. Femoral hernia', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e. sliding hernia", 'role': 'assistant'}]