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': 'Delirium can occur from poisoning of which of the\nfollowing: \nSelect and explain. \nA. Lead, B. Copper, C. Arsenic, D. Digitalis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]