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: Orthopaedics
[{'content': 'Superficial heat therapy among the following \nSelect and explain. \nA. Infrared lamp, B. Microwave diathermy, C. Ultrasonic therapy, D. Shortwave diathermy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]