This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'Pseudoporphyria can be induced by all except \nSelect and explain. \nA. Methotrexate, B. Nalidixic acid, C. Naproxen, D. Isotretinoin', 'role': 'user'}, {'content': "Answer: A \nExplanation: Pseudoporphyria is generally due to drugs or other agents which interact with sunlight to cause a phototoxic reaction in the skin. These include:Non-steroidal anti-inflammatory drugs e.g. naproxenAntibiotics - doxycycline, nalidixic acidDiuretics - chlohalidone, bumetanide, furosemide (frusemide) and hydrochlorothiazide/triamtereneRetinoids - isotretinoin, etretinate, acitretinOral contraceptives(ref:Harrison's 18/e p414,415)", 'role': 'assistant'}]