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: Medicine
Spinal segment in knee jerk include all of the following except : 
Select and explain. 
A. L1, B. L2, C. L3, D. L4
A: L1
Answer: A: L1 
Explanation: Answer is A (L1): Knee jerk is associated with spinal segments L3, L4 and according to some L2 also.