This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Anatomy
[{'content': 'Episiotomy incision was extended posteriorly beyond perineal body injuring the structure immediately posterior to it. Which structure has been injured \nSelect and explain. \nA. External anal sphincter, B. Ischiocavernosus, C. Bulbospongiosus, D. Urethral sphincter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ext. anal sphincteris present just posterior to perineal body. Therefore, Ext. anal sphincter can be injured when episiotomy incision given posteriorly beyond perineal body.', 'role': 'assistant'}]