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': 'First sign in sympathetic ophthamilis is : \nSelect and explain. \nA. Presence of aquous flare, B. Presence of precipitates, C. Constriction of pupil, D. Retrolental flare', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Retrolental flare', 'role': 'assistant'}]