This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'The antitubercular drug which impacts red colouration to urine is: \nSelect and explain. \nA. 1NH, B. Pyrazinamide, C. Rifampicin, D. Ethambutol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Rifampicin', 'role': 'assistant'}]