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: Radiology
Which is not a deep heat therapy. 
Select and explain. 
A. Sho wave diathermy, B. Infra Red, C. USG, D. Microwave
B: Infra Red
Answer: B: Infra Red 
Explanation: B i.e. Infra red