This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerves of Abdomen, Subject name: Anatomy
Nerve supply to the perineum is - 
Select and explain. 
A. Pudendal nerve, B. Inferior rectal nerve, C. Pelvic splanchnic nerves, D. Hypogastric plexus
A: Pudendal nerve
Answer: A: Pudendal nerve 
Explanation: Ans. is 'a' i.e., Pudendal nerve o Pudendal nerve arises from S2S3S4 and is a mixed nerve (motor + sensory).o It enters the gluteal region through greater sciatic notch and leaves it through lesser sciatic notch to enter pudendal canal.o Pudendal nerve is the chief nerve of perineum and external genitalia.