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': 'A 56-year-old patient presents after 3 days of cataract surgery with a history of increasing pain and diminished 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: Symptoms and signs of bacterial endophthalmitis are generally present between 48 and 72 hours after surgery and include: ocular pain, diminished vision, lid oedema, conjunctival chemosis and marked circumciliary congestion, corneal oedema, exudates in the pupillary area, hypopyon and diminished or absent red pupillary glow.', 'role': 'assistant'}]