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': 'In sympathetic ophthalmitis first sign is : \nSelect and explain. \nA. Presence of KPs., B. Retrolental flare, C. Presence of aquous flare, D. Constriction of pupil', 'role': 'user'}, {'content': "Answer: A \nExplanation: A i.e. Presence of KP's", 'role': 'assistant'}]