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
The most earliest sign of anterior uveitis is: 
Select and explain. 
A. Aqueous flare, B. Keratic precipitates, C. Constriction of pupil, D. Raised intraocular pressure
A: Aqueous flare
Answer: A: Aqueous flare 
Explanation: Ans. Aqueous flare