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: Gynaecology & Obstetrics
[{'content': 'Urethral closure involves interplay of following structures except \nSelect and explain. \nA. Suburethral vaginal hammock, B. Pubourethral Ligaments, C. Pubococcygeus muscle, D. Puborectalis muscle.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 3 Structures aiding in urethral closure\n\nPubourethral Ligament\nSuburethral vaginal hammock\nPubococcygeus muscle.', 'role': 'assistant'}]