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 –a) Depends on power of lens usedb) Depends on refractive error of patientc) Independent of refractive error of patientd) independent of power of lens used \nSelect and explain. \nA. ac, B. a, C. ab, D. bc', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Magnification of image in indirect ophthalmoscopy depends upon:-\n\n\nDioptric power of the convex lens\nThe position of the lens in relation to the eyeball\nRefractive state of the eyeball\n\n\nAbout 5 times magnification is obtained with a +13 D lens. With a stronger lens, the image will be smaller, but brighter and field of vision will be more.', 'role': 'assistant'}]