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
Ulcus serpens is caused by- 
Select and explain. 
A. Pseudomonas pyocynaeceous, B. Pneumoeoccus, C. Corynebacteria, D. Gonorrhoea niesseria
B: Pneumoeoccus
Answer: B: Pneumoeoccus 
Explanation: The characteristic hypopyon corneal ulcer caused by Pneumococcus is called 'ulcus serpens'. Reference:Comprehensive Ophthalmology,AK Khurana,6th edition,pg no.102