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: Dental
Which of the following is the uses of Lasers 
Select and explain. 
A. Oximetry, B. Laser Doppler flowmetry, C. Photoactivated disinfection, D. All of the following
D: All of the following
Answer: D: All of the following 
Explanation: None