This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
[{'content': 'A56 years old patient presents after three days of cataract surgery with a history of increasing pain and decrease of vision after an initial improvement the most likely cause would be \nSelect and explain. \nA. Endophthalmitis, B. After cataract, C. Central retinal vein occlusion, D. Retinal detachment', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pain which is increasing along with decrease in vision paicularly after only three days of cataract surgery strongly suggest endophthalmitis', 'role': 'assistant'}]