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: Unknown
[{'content': 'BAL (British anti-Lewisite, Dimercaprol) is of no value for the treatment of poisoning by: - \nSelect and explain. \nA. Arsenic, B. Mercury, C. Zinc, D. Selenium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: BAL (British anti-Lewisite, Dimercaprol)\nBAL (British anti-Lewisite, Dimercaprol) is a dithiol-chelating agent used in the treatment of poisoning by the heavy metals .\nIt is of no value for the treatment of poisoning by selenium, iron, or cadmium; in fact, it is contraindicated in these poisonings because the BAL metal (mercaptide) complex may be more toxic than the metal alone.', 'role': 'assistant'}]