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': 'All of the following can precipitate the attack of narrow angle except: \nSelect and explain. \nA. Prolonged prone position, B. Mydriatics, C. Prolonged work in bright light, D. Emotional upsets', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. Prolonged work in bright light', 'role': 'assistant'}]