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: Surgery
[{'content': 'Laser with deepest tissue penetration is: \nSelect and explain. \nA. Argon, B. Carbon dioxide, C. Nd YAG, D. None of the above', 'role': 'user'}, {'content': "Answer: C \nExplanation: Nd:YAG laser light is 1.064 m (1064 nm) in wavelength. It is in the near-infrared poion of the spectrum, and, like CO2 laser light, is invisible to the naked eye. A unique feature of the Nd:YAG laser is that 1064-nm light is poorly absorbed by most tissue pigments and therefore travels deep into tissue. Deep tissue penetration provides deep tissue heating. For this reason, the Nd:YAG laser is capable of the greatest amount of tissue destruction with a single application. Ref: Schwaz's principle of surgery 9th edition, chapter 14.", 'role': 'assistant'}]