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 method is used for standardization testing of waxes: 
Select and explain. 
A. Infrared lamp., B. Water bath., C. Bunsen burner., D. Nd-Yag laser.
A: Infrared lamp.
Answer: A: Infrared lamp. 
Explanation: The method of softening used in standardization testing of waxes involves the use of 250 Watts infra-red lamps.