This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
[{'content': 'A dendritic ulcer is caused by – \nSelect and explain. \nA. Mycetoma, B. Herpes simplex, C. Staphylococcus, D. Pneumococcus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dendritic ulcer is a typical lesion of HSV keratitis.', 'role': 'assistant'}]