This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Retina, Subject name: Ophthalmology
[{'content': 'Which of the following group of drugs can cause Cystoid macular edema? \nSelect and explain. \nA. Prostaglandin F2a analogue, B. Prostaglandin E2 analogues, C. Oral corticosteroids, D. a blockers', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Prostaglandin E2 analoguesRef: Becker-Shaffer Glaucoma 8/e, p. 400Drugs causing Cystoid macular edema* Benzylalkonium chloride* Timolol* Dinoprostone (PGE2 analogues)', 'role': 'assistant'}]