This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
Which of the following movements will not be affected by involvement of the L5 Nerve root? 
Select and explain. 
A. Thigh abduction, B. Knee Flexion, C. Knee Extension, D. Toe Extension
C: Knee Extension
Answer: C: Knee Extension 
Explanation: Knee extension is carried out by L-2, 3 and 4 (Femoral nerve). Injury at the level of L- 5, doesn't affect knee extension. Knee flexion is carried out by the root value: L -5 and S-1 (Tibial nerve). Toe extension requires L-5 (deep peroneal nerve) Ref - BDC 6th e p140 lowerlimb