This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, 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. Ketoconazole', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Natamycine(5%),Amphotericin B(0.1 to 0.3%), and either fluconazole(0.2%) or miconazole(10mg/ml) or voriconazole are effective against Aspergillus and Fusarium.Reference:Comprehensive ophthalmology,AK Khurana,6th edition,page no.106', 'role': 'assistant'}]