This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve supply of Lower Limb, Subject name: Anatomy
The patient presented with loss of extension at knee joint with decreased sensation over anterior aspect of thigh. The nerve damaged is: 
Select and explain. 
A. Obturator, B. Femoral, C. Common peroneal, D. Tibial
B: Femoral
Answer: B: Femoral 
Explanation: Femoral nerve supplies the extensors at knee joint and skin over the anterior aspect of thigh as well. Injury of the femoral is uncommon but may be injured by a stab, gunshot wounds, during hip operations or a pelvic fracture leading to - Motor loss: Poor flexion at the hip joint, because of paralysis of the iliacus and saorius muscles. Inability to extend the knee, because of paralysis of the quadriceps femoris. Sensory loss: over the anterior and medial aspects of the thigh over the medial side of the leg and foot up to the back of the great toe