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': "Vogt's triad is indicative of: \nSelect and explain. \nA. Past attack of herpes zoster ophthalmicus, B. Past attack of acute-angle closure glaucoma, C. Vogt-Koyanagi-Harada syndrome, D. Past attack of acute iridocyclitis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Past attack of acute-angle closure glaucoma', 'role': 'assistant'}]