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
Which of the following lasers is used for treatment of benign prostatic hyperplasia as well as urinary calculi? 
Select and explain. 
A. CO2 laser, B. Excimer laser, C. Ho: YAG laser, D. Nd: YAG laser
C: Ho: YAG laser
Answer: C: Ho: YAG laser 
Explanation: 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