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': 'What is the area of retina visualised under direct ophthalmoscope? \nSelect and explain. \nA. 1DD, B. 2DD, C. 3DD, D. 4DD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Area of retina visualised under direct ophthalmoscope is 2DD. Image formed is viual, erect and magnified 15 times. Area of retina visualised under indirect ophthalmoscope is 8DD. Image formed is real, inveed and magnified 4-5 times.', 'role': 'assistant'}]