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: Unknown
[{'content': 'Not seen in acute iridocyclitis: \nSelect and explain. \nA. Small pupil, B. Mucopurulent discharge, C. Ciliary congestion, D. Pain', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Some Clinical Features of Acute Iridocyclitis', 'role': 'assistant'}]