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: Pathology
[{'content': 'Pigmented lesions of oral mucosa do occur because of the consumption of following drug EXCEPT \nSelect and explain. \nA. Nifedipine, B. Zidovudine, C. Minocycline, D. Oral contraceptives', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]