This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Introduction to Radiology, Subject name: Radiology
ALARA stands for? 
Select and explain. 
A. As low as reasonably achievable, B. As low as radiation achievable, C. As low as reasonably accountable, D. None of the above
A: As low as reasonably achievable
Answer: A: As low as reasonably achievable 
Explanation: As low as reasonably achievable (ALARA) is a principle of radioprotection stating that whenever ionizing radiation has to be applied to humans, animals or materials exposure should be as low as reasonably achievable. It is fundamental to the principles of radiation protection. 3 basic principles of ALARA: Time Distance Shielding.