This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve supply, Nerve Lesions, Subject name: Anatomy
What is the root value of Biceps jerk 
Select and explain. 
A. C5-C6, B. C6-C7, C. C7-C8, D. C8-T1
A: C5-C6
Answer: A: C5-C6 
Explanation: Biceps jerk C5, 6 Triceps jerk C6-8 Radial jerk C7, 8 Biceps jerk (C5, 6) - The elbow is flexed to a right angle and slightly pronated. A finger is placed on the biceps tendon and struck with a percussion hammer; this should elicit flexion and slight supination of the forearm.