If a patient has an absent knee reflex on their right leg, what could this symptom potentially indicate?

A: It's a sign of an upper motor neuron lesion affecting the right leg, possibly due to stroke on the left side of the brain.

B: An absent right knee reflex may suggest a lower motor neuron lesion, such as discal herniation at level C2-4.

C: An absent right knee reflex may suggest a lower motor neuron lesion, such as discal herniation at level L2-4.

D: An absent right knee reflex points to a traumatic injury of the tibial nerve.

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