This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of the Anal Canal, Subject name: Surgery
Pain of External hemorrhoids is carried by? 
Select and explain. 
A. Pudendal nerve, B. Perineal nerve, C. Superior rectal nerve, D. Dorsal nerve of penis or clitoris
A: Pudendal nerve
Answer: A: Pudendal nerve 
Explanation: ANSWER; (A) Pudendal nerveREF: Gray's anatomy 39th ed p- 1371External hemorrhoids are innervated by cutaneous nerves that supply the perianal area, such as the pudendal nerve and branches of the sacral plexusInternal hemorrhoids are not innervated and cannot cause pain.