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
[{'content': 'Which method is used for standardization testing of waxes: \nSelect and explain. \nA. Infrared lamp., B. Water bath., C. Bunsen burner., D. Nd-Yag laser.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The method of softening used in standardization testing of waxes involves the use of 250 Watts infra-red lamps.', 'role': 'assistant'}]