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: Unknown
Most common obstetrics nerve palsy? 
Select and explain. 
A. Foot drop, B. Facial nerve, C. Median nerve, D. Radial nerve
A: Foot drop
Answer: A: Foot drop 
Explanation: Ref. DC Dutta's Textbook of Obstetrics. Pg 511
The commonest form of obstetric palsy encountered in puerperal period is foot drop. It is usually unilateral and appears shortly after delivery or during first day postpartum or so. It is thought to be  due to stretching of the lumbosacral trunk by the prolapsed intervertebral disc between L5 and S1.