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
[{'content': 'Which of the following facilitates comparison between different radiations? \nSelect and explain. \nA. Rad, B. Rem, C. Quality factor exposure, D. Roentgen', 'role': 'user'}, {'content': 'Answer: B \nExplanation: EQUIVALENT (RADIATION-WEIGHTED) DOSE:\nThe equivalent dose (HT) is used to compare the biologic effects of different types of radiation on a tissue or organ. Particulate types of radiation have a high LET and are more damaging to tissue than radiation with low LET, such as x rays. This relative biologic effectiveness of different types of radiation is called\xa0 the radiation-weighting\xa0 factor (WR).\nThe unit of equivalent dose is the sievert (Sv). For diagnostic x-ray examinations, 1 Sv equals 1 Gy.\xa0\nThe traditional unit of equivalent dose is the rem (roentgen equivalent man); 1 Sv\xa0 equals 100 rem.\nOral Radiology, Principles and Interpretation / Stuart C. White, Michael J. Pharoah - 7th ed - pg - 15', 'role': 'assistant'}]