This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Uveal tract, Subject name: Ophthalmology
[{'content': 'Which of the following indicates activity of anst uveitis - \nSelect and explain. \nA. Cells in anterior chamber, B. Circumcorneal congestion, C. Keratic precipitate, D. Corneal edema', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Activity of acute anterior uveitis is indicated by presence of cells (aquous cells) and flare in anterior chamber -Grading is done on these two. Ref: Khurana 7th/e p.158 & 4th/e p.143.', 'role': 'assistant'}]