This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Forensic Toxicology - Concepts, Statutes, Evidence, and Techniques, Subject name: Forensic Medicine
[{'content': 'Corpoporphyrin in urine is seen in which of the poisoning? \nSelect and explain. \nA. Copper, B. Lead, C. Arsenic, D. Mercury', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) LeadRef Parikh 6/e, p 9.22', 'role': 'assistant'}]