This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
[{'content': 'Muscle in extension compament of forearm which causes flexion of elbow \nSelect and explain. \nA. Brachioradialis, B. Abductor pollicis longus, C. Extensor pollicis longus, D. Extensor caipi radialis longus', 'role': 'user'}, {'content': "Answer: A \nExplanation: Brachioradialis - flexes forearm at elbow joint; rotates forearm to the mid prone position from supine or prone positions. Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 1 , pg. no., 138", 'role': 'assistant'}]