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: Dental
[{'content': 'The following drug is effective in treatment of ptyriasis versicolor – \nSelect and explain. \nA. Ketoconazole, B. Metronidazole, C. Griseofulvin, D. Chloroquine', 'role': 'user'}, {'content': "Answer: A \nExplanation: Treatment of P. versicolor\n\nSystemic\xa0→\xa0Ketoconazole,\xa0Fluconazole, Itraconazole.\nTopical\xa0→\xa0Azoles\xa0(clotrimazole,\xa0econazole, micronazole, ketoconazole),\xa0selenium sulfide,\xa0sodium thiosulphate, whitfield's ointment (3% salicylic acid + 6% benzoic acid).", 'role': 'assistant'}]