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': 'All of the following muscles contribute to  urogenital sphincter complex except \nSelect and explain. \nA. Compressor urethrae, B. Sphincter urethrae, C. Urethrovaginal sphincter, D. Bladder base detrusor muscle', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Urogenital sphincter is composed of striated muscles:\n\nSphincter urethrae\nUrethrovaginal sphincter\nCompressor urethrae.', 'role': 'assistant'}]