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
FeCl test is used in diagnosis of 
Select and explain. 
A. HCl, B. Acetic acid, C. Alcohol, D. Phenol
D: Phenol
Answer: D: Phenol 
Explanation: 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