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
[{'content': 'All are branches of lumbar plexus except : \nSelect and explain. \nA. Obturator nerve, B. Sub costal nerve, C. Iliohypogastric, D. Ilioinguinal', 'role': 'user'}, {'content': "Answer: B \nExplanation: Subcostal nerve is an anterior division of 12 the thoracic nerve which is larger than other intercostal nerves. Ref: Gray's Anatomy The Anatomical Basics of Clinical Practice 41 e pg 1371.", 'role': 'assistant'}]