This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Poisoning, Subject name: Forensic Medicine
[{'content': 'FeCl test is used in diagnosis of \nSelect and explain. \nA. HCl, B. Acetic acid, C. Alcohol, D. Phenol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Diagnosis of phenol poisoning change in color of urine(carboluria) Ferric chloride when added color of urine turns blue. Ref: FORENSIC MEDICINE AND TOXICOLOGY Dr PC IGNATIUS THIRD EDITION PAGE 414', 'role': 'assistant'}]