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': 'The pathognomonic sign of acute iridocyclitis is: \nSelect and explain. \nA. Small pupil, B. Aqueous flare, C. Keratic precipitates, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Keratic precipitates', 'role': 'assistant'}]