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, earliest sign is: \nSelect and explain. \nA. KP, B. Retrolental flare, C. Aquous flare, D. Hypopion', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A i.e. KP', 'role': 'assistant'}]