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': 'In chronic lead poisoning, diagnostic increase in levels of: September 2004 \nSelect and explain. \nA. Bile, B. Calcium, C. Urobilinogen, D. Coproporphyrin III', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Coproporphyrin III', 'role': 'assistant'}]