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: Gynaecology & Obstetrics
The nerve roots blocked in pudendal nerve block is: 
Select and explain. 
A. L1,2,3, B. L2,3, C. S2,3,4, D. S4
C: S2,3,4
Answer: C: S2,3,4 
Explanation: Pudendal nerve block:

Pudendal nerve arises from: S2, S3, S4 and therefore pudendal nerve block - will block S2, S3, S4, nerve roots.
It is used for perineal analgesia and relaxation.
Anaesthesia used is 20 ml of 1% lignocaine.
Route: Transvaginal and perineal route.
Site: Pudendal nerve is blocked just above the tip of ischial spine.

Indications:

Prior to application of forceps or vacuum
To suture vaginal lacerations
In Assisted breech delivery.