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': 'Which antifungal drug is an anti-metabolite? \nSelect and explain. \nA. Ketoconazole, B. Flucytosine, C. Terbinafine, D. Griseofulvin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Flucytosine', 'role': 'assistant'}]