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': 'Area of fundus seen with direct ophthalmoscope \nSelect and explain. \nA. 1 DD, B. 2 DD, C. 3 DD, D. 4 DD', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. 2 DD', 'role': 'assistant'}]