This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Ophthalmology
[{'content': 'Confocal scanning laser ophthalmoscope uses- \nSelect and explain. \nA. Infrared laser, B. Diode laser, C. Excimerlaser, D. YAG laser', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Confocal scanning laser ophthalmoscope:- *It is an instrument using confocal laser system to provide and analyse three dimentional image of the optic nerve head, peripapillary retina and macular region. *It uses a 670nm diode laser and measures the amount of light reflected from a series of 16-64 sections in depth and reconstructs them to show the anotomy of the optic nerve head and reconstruct the anatomy of the retinal nerve fiber layer. Ref: Dictionary of optometry and visual science', 'role': 'assistant'}]