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': 'Penicillamine is commonly used in the management of following heavy metal poisoning except \nSelect and explain. \nA. Arsenic, B. Copper, C. Lead, D. Mercury', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]