Unknown General 9d5e79c8 Root value of knee-jerk - A L1L2 B L3L4 C L5S1 D S1 S2 High-Yield Explanation 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