Root value of knee-jerk -
Ans. is 'b' i.e., L3L4ReflexRoot valueBiceps reflex (biceps jerk)C5 C6Supinator reflex (Supinator jerk)C5 C6Triceps reflex (Triceps jerk)C7 C8Knee jerkL3 L4Ankle jerkS1 S2
L1L2
L3L4
L5S1
S1 S2