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': 'All of the following can precipitate porphyria except ? \nSelect and explain. \nA. Steroids, B. Griesiofulvin, C. Penicillin, D. Estrogen', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Penicillin Penicillin is a safe drug in acute intermittent porphyria Drugs precipitating acute intermittent porphyria Barbiturates Griseofulvin Chlorpropramide Rifampicin Oral contraceptives Estrogen Phenytoin Sulfonamides", 'role': 'assistant'}]