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': "In which of the following conditions Berlin's edema is seen - \nSelect and explain. \nA. Open angle glaucoma, B. After cataract surgery, C. After concussional trauma, D. Diabetic retinopathy", 'role': 'user'}, {'content': "Answer: C \nExplanation: Berlin's oedema, also called comnzotio retinae, occurs in blunt trauma to eye. It manifests as milky white cloudiness involving a considerable area of the posterior pole with a 'cherry-red' spot in the foveal region.", 'role': 'assistant'}]