This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexual offences and infanticide, Subject name: Forensic Medicine
[{'content': 'After sexual intercourse, the intact hymen usually ruptures \nSelect and explain. \nA. Anteriorly, B. In the midline posteriorly, C. On one side only, D. On both sides', 'role': 'user'}, {'content': "Answer: B \nExplanation: The hymen is a fold of mucous membrane, about 1 mm thick, situated at the vaginal outlet. In a prepubeal victim, vaginal penetration usually results in tearing of the hymen in the posterior 180deg, i.e. Between 3 and 9 o'clock position. Ref - Krishan Vij textbook of forensic medicine and toxicology 5e pg : 315", 'role': 'assistant'}]