This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Uveal tract, Subject name: Ophthalmology
[{'content': 'Most common symptom of posterior uveitis - \nSelect and explain. \nA. Pain, B. Photophobia, C. Lacrimation, D. Diminished vision', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Posterior uveitis(choroiditis) is a painless condition,usually characterised by visual symptoms due to associated vitreous haze and involvement of the retina.', 'role': 'assistant'}]