This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urology, Subject name: Anatomy
[{'content': 'Which of the following lasers is used for treatment of benign prostatic hyperplasia as well as urinary calculi? \nSelect and explain. \nA. CO2 laser, B. Excimer laser, C. Ho: YAG laser, D. Nd: YAG laser', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The holmium: YAG Laser is excellent for stone fragmentation and tissue ablation and is now the most popular system in use." - Smith\'s Urology Both Ho: YAG & Nd: YAG laser systems can be used for BPH, but only Ho:YAG is used for stone fragmentation. For BPH, Ho:YAG is preferred over Nd:YAG. Ref : Cambell\'s Urology 8/e p3393', 'role': 'assistant'}]