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': 'Which of the following is least likely to cause interstitial nephritis on chronic use- \nSelect and explain. \nA. Methicillin, B. Cephalothin, C. Heparin, D. Ampicillin', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Heparin Drug causing interstitial nephritis o Cephalosporine o Allopurinol o Phenindione o Thiazides o Rifampcin o Penicillins (esp. methicillin) o Ciprofloxacin o Sulphonamides o NSAIDS o Furosemide", 'role': 'assistant'}]