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': 'Green coloured urine seen in: (PGI June 2007) \nSelect and explain. \nA. Kerosene, B. Organophosphorus poisoning, C. Carbolic acid, D. Paracetamol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C (Carbolic acid poisoning) "Carbolic acid {phenol) poisoningQ urine may be colorless or slightly green\' at first but turns greenQ or even black on exposure to air"- Reddy 27th/470', 'role': 'assistant'}]