This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lens, Subject name: Ophthalmology
What is the new advance in cataract surgery? 
Select and explain. 
A. Femtosecond laser, B. Neodymium Laser, C. Nanosecond laser, D. Picosecond Laser
A: Femtosecond laser
Answer: A: Femtosecond laser 
Explanation: Ans. is 'a' i.e., Femtosecond laser * Femtosecond laser-assisted cataract surgery provides surgeons an exciting new option to potentially improve patient outcomes and safety.* In this surgery a femtosecond laser is used for various steps like lens fragmentation and capsulotomy.* Although the results have been good the technology is currently very expensive.