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': 'Which one of the following is the first symptom of sympathetic opthalmia? \nSelect and explain. \nA. Pain, B. Colored haloes, C. Photophobia, D. Color blindness', 'role': 'user'}, {'content': 'Answer: C \nExplanation: An early sign of sympathetic ophthalmia is a limited range of accommodation with photophobia. Sympathetic ophthalmia (SO) is a granulomatous uveitis of both eyes following trauma to one eye. The disease may progress to severe iridocyclitis with pain and photophobia. Commonly the eye remains relatively painless while the inflammatory disease spreads through the uvea, where characteristic focal infiltrates in the choroid named Dalen-Fuchs nodules are seen.', 'role': 'assistant'}]