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': 'Acute angle closure glaucoma \nSelect and explain. \nA. Colored haloes present, B. Flashes of light seen, C. Deep anterior chamber, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. Colored haloes present', 'role': 'assistant'}]