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': 'Drug of choice for fungal corneal ulcer: \nSelect and explain. \nA. Nystatin, B. Caspofungin, C. Natamycin, D. Amphotericin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Natamycin is a topical antifungal which is the drug of choice for fungal corneal ulcer.\nOther topical antifungals : Nystatin, Clotrimazole, Tolnaftate, Ciclopirox', 'role': 'assistant'}]