This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of nail, Subject name: Dental
[{'content': 'Drug that may induce nail pigmentation - melanonychia: \nSelect and explain. \nA. Retinoids, B. Carbamazepine, C. Tetracyclines, D. Zidovudine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Anthracyclines, taxanes, fluorouracil, psoralens, and zidovudine may induce nail pigmentation through melanocyte stimulation in nail matrix resulting in melanonychia. It appears to be reversible and dose-dependent and appears 3-8 weeks after drug intake.', 'role': 'assistant'}]