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
First sign in sympathetic ophthamilis is : 
Select and explain. 
A. Presence of aquous flare, B. Presence of precipitates, C. Constriction of pupil, D. Retrolental flare
D: Retrolental flare
Answer: D: Retrolental flare 
Explanation: D i.e. Retrolental flare