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
In sympathetic ophthalmitis, earliest sign is: 
Select and explain. 
A. KP, B. Retrolental flare, C. Aquous flare, D. Hypopion
A: KP
Answer: A: KP 
Explanation: A i.e. KP