This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Which of the following nerve serve as the efferent limb for cremasteric reflex? 
Select and explain. 
A. Hypogastric nerve, B. Genito femoral nerve, C. Ilioinguinal nerve, D. All of the above
B: Genito femoral nerve
Answer: B: Genito femoral nerve 
Explanation: Ilioinguinal nerve serve as the afferent limb and genitofemoral nerve serve as the efferent limb of cremasteric reflex. Cremasteric reflex is elicited by gently stroking the skin on the upper inner side of the thigh from above downwards. A positive response refers to contraction of the cremasteric muscle and elevation of the testicle on that side. An upper motor neuron injury can cause diminished or loss of the reflex.