This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerves of Lower Extremity, Subject name: Anatomy
Efferent cremastric reflex is carried by 
Select and explain. 
A. Illio inguinal nerve, B. Genito-femoral nerve, C. Iliohypogastric nerve, D. Pudendal nerve
B: Genito-femoral nerve
Answer: B: Genito-femoral nerve 
Explanation: Ans. (b) Genito-femoral nerveRef: Clinically Oriented Anatomy by Keith, Moore, 5thEd,/223# CREMASTERIC REFLEXEfferent: genital branch of genitofemoral nerveAfferent: Femoral branch of genitofemoral nerve* Contraction of the cremaster muscle is elicited by lightly stroking the skin on the medial aspect of the superior part of the thigh with an applicator stick or tongue depressor.* The ilioinguinal nerve supplies this area of skin.The rapid elevation of the testis on the same side is the cremasteric reflex. This reflex is extremely active in children* A hyperactive cremasteric reflex may simulate undescended testes.