This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conjunctiva, Subject name: Ophthalmology
Ulcer serpans is caused by 
Select and explain. 
A. Pseudomonas pyocynaceous, B. Pneumococcus, C. Corynebacterium, D. Neisseria gonorrhoea
B: Pneumococcus
Answer: B: Pneumococcus 
Explanation: The characteristic hypopyon corneal ulcer caused by Pneumococcus is called ulcus serpens. Characteristic features of ulcus serpens are : Ulcus serpens is a greyish white or yellowish disc - shaped ulcer occurring near the centre of cornea The ulcer has a tendency to creep over the cornea in a serpiginous fashion. Violent iridocyclitis is commonly associated with a definite hypopon Hypopon increases in size very rapidly and often results in secondary granuloma Ulcer spreads rapidly and has a great tendency for early perforation. Ref;A.K.Khurana; 6th edition; Page no:102 REF IMG