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: Pathology
The nerve root blocked in pudendal nerve block 
Select and explain. 
A. L2-3, B. L2-4, C. S2-4, D. L5, S1
C: S2-4
Answer: C: S2-4 
Explanation: Pudendal nerve block, blocks sacral segments (S2-4) thus provides perineal analgesia. The anesthesia is produced by blocking the pudendal nerves near the ischial spine of the pelvis. The pudendal block gets its name because a local anesthetic, such as lidocaine or chloroprocaine, is injected into the pudendal canal where the pudendal nerve is located. Ref Robbins 9/e pg 345