This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Gynaecology & Obstetrics
Episiotomy posteriorly beyond perineal body injuring the structure immediately posterior to it Which structure is injured 
Select and explain. 
A. External and sphincter, B. Ischiocavernosus, C. Bulbospongiosus, D. urethral sphincter
A: External and sphincter
Answer: A: External and sphincter 
Explanation: ref : DUTTA BOOK 9TH ED