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': 'Brown coloured urine is seen in which poisoning \nSelect and explain. \nA. Nitric acid, B. Carbolic acid, C. Sulphuric acid, D. Hydrochloric acid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: color of urine in different poisoning carbolic acid-green Nitric acid- brown Barbiturates - liquid gold Ref: Dr. Bhatia Medical Toxicology', 'role': 'assistant'}]