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': 'Rupture of membranous Urethra occurs more commonly due to - \nSelect and explain. \nA. Thin unsuppoed wall, B. Fixity of Urethra, C. Angulation, D. Proximity to bladder', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Fixity of Urethra", 'role': 'assistant'}]