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': 'Magnification in Indirect ophthalmoscopy: \nSelect and explain. \nA. Depends on power of lens used, B. Depends on refractive error of pt, C. Independent of refractive error of pt, D. All', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 2DD', 'role': 'assistant'}]