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: Forensic Medicine
Most  common position of hymen rupture in a virgin is 
Select and explain. 
A. Anterior, B. Anterio - lateral, C. Posterio - lateral, D. Posterior
C: Posterio - lateral
Answer: C: Posterio - lateral 
Explanation: Hymen tears

Congenital - Anterion
Intercourse / foreign body - posterolateral
In a virgin, laceration of hymen occurs with the first intercourse
This is the principal evidence of intercourse in a virgin
Tearing of hymen usually occurs postero - laterally or in the middle.

Other conditions causing ruptured hymen before coitus

Accidents
Mastrubation
Instrumentation by doctors
Artifical dilatiation of vagina by foreign bodies for prostitution
Passage of large blood clots.