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
All are branches of lumbar plexus except 
Select and explain. 
A. Iliohypogastric nerve, B. Ilioinguinal nerve, C. Obturator nerve, D. Subcostal nerve
D: Subcostal nerve
Answer: D: Subcostal nerve 
Explanation: LUMBAR PLEXUS - The lumbar plexus lies in the posterior pa of the substance of the psoas major muscle. It is formed by the ventral rami of the upper four lumbar nerves .The first lumbar nerve receives a contribution from the subcostal nerve, and the fouh lumbar nerve gives a contribution to the lumbosacral trunk; which takes pa in the formation of the sacral plexus. The branches of the lumbar plexus are given below - 1. The iliohypogastric nerve (LI), 2. The ilioinguinal nerve (LI), 3. The genitofemoral nerve (LI, L2 ventral divisions), 4. The lateral cutaneous nerve of the thigh (L2, L3; dorsal divisions), 5. The femoral nerve (L2, L3, L4; dorsal divisions), 6. The obturator nerve (L2, L3, L4; ventral divisions), 7. The lumbosacral trunk (L4, L5; ventral rami). Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 2 , pg. no. 373