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: Medicine
[{'content': 'A 60 year old man presents with choreoathetosis. O/e KF rings is seen in cornea. Initial treatment of choice is \nSelect and explain. \nA. Zinc, B. Penicillamine, C. Pyridoxine, D. Trientine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Zinc is the initial treatment of choice.', 'role': 'assistant'}]