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: Ophthalmology
[{'content': 'Which of the following is the drug of choice of treatment of corneal ulcers caused by filamentous fungi? \nSelect and explain. \nA. Itraconazole, B. Natamycin, C. Nystatin, D. Fluconazole', 'role': 'user'}, {'content': 'Answer: B \nExplanation: "The drug of choice for filamentous infections is natamycin and amphotericin B (0.15%) is the drug of choice for candida". ___\xa0Atals of clinical ophthalmology\n"Polyene antifungals, natamycin (5%) and amphotericin B (0.15-0.25%) are the most commonly used drugs". ____ Ocular therapeutics\n"Treatment by means of local natamycin and amphotericin B drops, and miconazole ointment, these are effective against Aspergillus and fusarium (filamentous fungi)".', 'role': 'assistant'}]