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': 'Drug of choice for iridocyclitis is: \nSelect and explain. \nA. Atropine, B. Streoid, C. Pilocarpine, D. Timolol', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Atropine', 'role': 'assistant'}]