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
A 26 year old male presented to the dental clinic with pain in the right lower back tooth region. On examination, it was evident that pericoronitis is present with 48. Panoramic imaging is done to visualize the status of impacted tooth. This type of imaging technique uses: 
Select and explain. 
A. Electromagnetic radiations which are ionizing in nature, B. Electromagnetic radiations which are non-ionizing in nature, C. High energy particulate radiations which are ionizing in nature, D. High energy particulate radiations which are non-ionizing in nature
A: Electromagnetic radiations which are ionizing in nature
Answer: A: Electromagnetic radiations which are ionizing in nature 
Explanation: Diagnostic imaging with projection radiography and computed tomography use X-rays, a category of electromagnetic radiation that is ionizing in nature. 
Magnetic resonance imaging uses electromagnetic radiations of significantly lower energies than X-rays and at energies that are non-ionizing. 
High-energy electromagnetic radiations (gamma rays, γ) and high-energy particulate radiations (electron beams and protons) are used in cancer therapy. 
Reference: ORAL RADIOLOGY PRINCIPLES AND INTERPRETATION,8th EDITION, Stuart C. White,Michael J. Pharoah