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
Confocal scanning laser ophthalmoscope uses ? 
Select and explain. 
A. Infrared laser, B. Diode laser, C. Excimerlaser, D. YAG laser
B: Diode laser
Answer: B: Diode laser 
Explanation: Ans. is 'b' i.e., Diode laser Confocal scanning laser ophthalmoscope It is an instrument using confocal laser system to provide and analysethree dimentional image of the optic nerve head, peripapillary retina, and macular region. It uses a 670 nm diode laser and measures the amount of light reflected froma series of 16 - 64 sections in depth and reconstructs them to show the anatomy of the optic nerve head and reconstruct the anatomy of the retinal nerve fiber layer.