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: Gynaecology & Obstetrics
[{'content': 'Episotomy extended posteriorly beyond perineal body injuring structure posterior to it, which structure is injured? \nSelect and explain. \nA. External anal sphincter, B. Ishiocavernous, C. Bulbospongiosus, D. Urethral sphincter', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Episotomy extended posteriorly beyond perineal body will injure External anal sphincter. Extension of the incision in median episiotomy involve the rectal mucosa. structures attaching on perineal body Bulbospongiosus: anteriorly, surrounding urethra and vaginal opening Transverse perinei: laterally External anal spincter: posteriorly, surrounding anal opening.', 'role': 'assistant'}]