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': 'Sign of activity in chronic iridocyclitis is: \nSelect and explain. \nA. Aqueous cells, B. Aqueous flare, C. Pigmented KPs, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Aqueous cells', 'role': 'assistant'}]