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: Surgery
[{'content': 'LASER that can be used in treatment of ureteric calculi \nSelect and explain. \nA. CO2 laser, B. Nd-Yag, C. Holmium, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]