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: Unknown
[{'content': 'This laser is ? \nSelect and explain. \nA. Ruby, B. CO2, C. YAG, D. Argon', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Nd: YAG lasers are used to make a non-invasive opening in the after cataract.', 'role': 'assistant'}]