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': 'Which of the following indicates activity of ant uveitis: \nSelect and explain. \nA. Cells in anterior chamber, B. Circumcorneal congestion, C. Keratic precipitate, D. Corneal edema', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Cells in anterior chamber', 'role': 'assistant'}]