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: Pharmacology
[{'content': 'During the delivery, it is necessary to do an episiotomy. The tear extends through sphincter of the rectum, but the rectal mucosa is intact. How would you classify this type of perineal tear? NOT RELATED-GYN \nSelect and explain. \nA. Ist Degree, B. 2nd degree, C. 3rd degree, D. 4th degree', 'role': 'user'}, {'content': 'Answer: C \nExplanation: A first degree tear involves the vaginal mucosa or perineal skin, but not the underlying tissue. In a second degree episiotomy, the underlying subcutaneous tissue is also involved, but not the rectal sphincter or rectal mucosa. In a third degree tear, the rectal sphincter is affected. A fouh-degree episiotomy involves a tear that extends into the rectal mucosa.', 'role': 'assistant'}]