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: Anaesthesia
Pudendal nerve block 
Select and explain. 
A. S1-3, B. S2-4, C. S3-5, D. S4,5
B: S2-4
Answer: B: S2-4 
Explanation: Pudendal Nerve BlockIt is a peripheral nerve block that provides local anesthesia over S2-4 dermatomes (majority of perineum and inferior quaer of vagina)It does not block the superior bih canal so the mother is able to feel the uterine contractions(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no.847)