This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anti-Tuberculosis, Subject name: Pharmacology
[{'content': 'Which of the follow ing causes urine discoloration- \nSelect and explain. \nA. Isoniazid, B. Rifampin, C. Streptomycin, D. Ethambutol', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Rifampin Drugs causing urine discolourationo Chloroquineo Iron saltso Levodopao Metbyldopao Metronidazoleo Naphthaleneo Nitrofurantoino Phenacetino Quinineo Sulfonamideso Anthraquinoneo Methylene blueo Triamtereneo Amitriptylineo Primaquineo Rifampino Aminosalicylic acido Indomethacino Chlorzoxazoneo Heparino Phenazopyridineo Phenindioneo Sulfasalazineo Warfarino Aminopyrineo Phenolphthaleino Daunorubicino Doxorubicino Riboflavin", 'role': 'assistant'}]