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
[{'content': 'What is ther new advance in cataract surgery? \nSelect and explain. \nA. Femtosecond Laser, B. Neodymium laser, C. Nanoseond laser, D. Picosecond Laser', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Femtosecond laser-assisted cataract surgery provides suirgeons 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. (Ref: Femtosecond laser-assisted cataract surgery: Kendall E. Donaldson, Rosa Braga-Mele, Florence Cabot, for the ASCRS Refractive Cataract Surgery Subcommittee0', 'role': 'assistant'}]