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
During incision and drainage of ischiorectal abscess, which nerve is affected 
Select and explain. 
A. Superior rectal nerve, B. Inferior rectal nerve, C. Inferior gluteal nerve, D. Ilioinguinal nerve
B: Inferior rectal nerve
Answer: B: Inferior rectal nerve 
Explanation: Contents of ischiorectal fossa

Fat
Pudendal canal and its contents
Inferior rectal nerve and vessels.