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
Green coloured urine seen in: (PGI June 2007) 
Select and explain. 
A. Kerosene, B. Organophosphorus poisoning, C. Carbolic acid, D. Paracetamol
C: Carbolic acid
Answer: C: Carbolic acid 
Explanation: 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