This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Root value of biceps jerk? 
Select and explain. 
A. C5C6, B. C4C5, C. C6C7, D. c8T1
A: C5C6
Answer: A: C5C6 
Explanation: Ans. a (C5 C6). (Ref. Ganong, Physiology, 21st/pg. l30)SPINAL LEVELREFLEXC5-6SupinatorC5-6BicepsC7TricepsL3-4KneeS1AnkleEducational points:Spinal Cord Levels Relative to the Vertebral BodiesSpinal Cord LevelCorresponding Vertebral BodyUpper cervicalSame as cord levelLower cervical1 level higherUpper thoracic2 levels higherLower thoracic2 to 3 levels higherLumbarT10-T12SacralT12-L1