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': 'Ulcus serpens is caused by- \nSelect and explain. \nA. Pseudomonas pyocynaeceous, B. Pneumoeoccus, C. Corynebacteria, D. Gonorrhoea niesseria', 'role': 'user'}, {'content': "Answer: B \nExplanation: The characteristic hypopyon corneal ulcer caused by Pneumococcus is called 'ulcus serpens'. Reference:Comprehensive Ophthalmology,AK Khurana,6th edition,pg no.102", 'role': 'assistant'}]