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: Anatomy
[{'content': 'During incision and drainage of ischiorectal abscess, which nerve is affected \nSelect and explain. \nA. Superior rectal nerve, B. Inferior rectal nerve, C. Inferior gluteal nerve, D. Ilioinguinal nerve', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Contents of ischiorectal fossa\n\nFat\nPudendal canal and its contents\nInferior rectal nerve and vessels.', 'role': 'assistant'}]