###Rationale: Fusarium and Aspergillus are the most common filamentous organisms causing fungal keratitis. The drug of choice for filamentous infection is natamycin. Ref: Comprehensive Pphthalmology By A K Khurana, 4th Edition, Pages 100-1; The Wills Eye Hospital Atlas of Clinical Ophthalmology By William Tasman, 2nd Edition, Page 25.

###Answer: OPTION B IS CORRECT.
###Question: Which of the following is the drug of choice in the treatment of corneal ulcers caused by filamentous fungi?
###Options:
A. Nystatin
B. Natamycin
C. Fluconazole
D. Itraconazole
