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': 'Painful loss of vision is seen in : \nSelect and explain. \nA. Senile cataract, B. Primary open angle glaucoma, C. Primary angle closure glaucoma, D. Anterior uveitis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: C i.e Primary angle closure glaucoma', 'role': 'assistant'}]