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: Anatomy
[{'content': 'Which of the following is not a sphincter in the female urogenital tract - \nSelect and explain. \nA. Pubovaginalis, B. External urethral sphincter, C. Internal urethral sphincter, D. Bulbospongiosus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Urogenital sphincters in Females\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Vaginal sphincters\n\nBulbospongiosus\nSphincter urethrovaginalis\nExternal urethral sphincter\nPubovaginalis\n\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Urinary sphincters\n\nCompressor urethrae\nExternal urethral sphincter\nSphincter urethrovaginalis\nPubourethralis', 'role': 'assistant'}]