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': 'Which of the following is true of dendritic ulcer: \nSelect and explain. \nA. Caused by Herpes simplex virus, B. Topical coicosteroid given suppresses the symptoms, C. Oral acyclovir is effective in treatment, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Caused by herpes simplex virus', 'role': 'assistant'}]