This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Injury to radial nerve in lower pa of spiral groove: \nSelect and explain. \nA. Spares nerve supply to extensor carpi radialis longus, B. Results in paralysis of anconeus muscle, C. Leaves extensions at elbow joint intact, D. Weakens pronation movement', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e. Leaves extension at elbow joint intact Triceps, anconeus are supplied by radial nerve above the level of spiral groove; so these are spared in injuries of radial n. at & below spiral groove thus leaving elbow extension intact Q', 'role': 'assistant'}]