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': 'The Hymen is the membranous vestige of junction between \nSelect and explain. \nA. Sinovaginal bulbs and urogenital sinus, B. Cloaca and mullerian duct, C. Mullerian duct and urogenital sinus, D. Mullerian duct and sinovaginal bulbs', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Hymen is the Partition between sino vaginal bulbs and urogenital sinus.', 'role': 'assistant'}]