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': 'Damage to the radial nerve in the spiral groove spares which muscle - \nSelect and explain. \nA. Lateral head of triceps, B. Long head of triceps, C. Medial head of triceps, D. Anconeus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The radial nerve while passing through the spiral groove gives away branches to lateral head and medial head of triceps. The medial head also receives fibers from portion of radial nerve that lies before the spiral groove, through medial muscular branch. Since this is a single answer type of question, the best answer would be long head of triceps.', 'role': 'assistant'}]