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': 'The frequent mechanism in perforation of appendix is- \nSelect and explain. \nA. Impacted faecolith, B. Tension gangrene due to the accumulating secretions, C. Necrosis of lymphoid patch, D. Retrocaecal function', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]