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': 'Muscle supplied by lumber plexus is? \nSelect and explain. \nA. Obturator extemus, B. Obturator internus, C. Piriformis, D. Gastrocnemius', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref - medscape.com', 'role': 'assistant'}]