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: Forensic Medicine
[{'content': 'Which is excreted typically in lead poisoning: \nSelect and explain. \nA. Urobilinogen, B. Coproporphyrin, C. Bilirubin, D. Bile salts', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Coproporphyrin', 'role': 'assistant'}]