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
Radiation exposure occurs in all except 
Select and explain. 
A. CT Scan, PET scan, B. MRI, C. Fluroscopy, D. Plain X-Ray
B: MRI
Answer: B: MRI 
Explanation: B i.e. MRI Radiography use X-rays, which are ionizing radiation.Q Thermography or thermal imaging is a type of infrared imagine. Thermographic cameras detect radiation in the infrared range of the electromagnetic spectrum (roughly 900-14,000 nanometer or 0.9-14 um) MRI & USG has no radiation riskQ.