This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
Which one of the following is not an ionizing radiation? 
Select and explain. 
A. Infrared radiation, B. X-rays, C. Gamma rays, D. Consmic rays
A: Infrared radiation
Answer: A: Infrared radiation 
Explanation: Ionising radiation is applied to radiation which has the ability to penetrate tissues and deposit its snergy within them.Includes - electro magnetic radiations(X rays ,gamma rays,) -corpuscular radiations (alpha paicles,beta paicles and protons) Non ionising radiation refers to electromagnetic radiations of wavelength longer than ionising.Include UV rays,visible light, IR rays,microwavecradiation. Parks textbook of preventive and social medicine.K Park. Edition 23.page no:744