This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
[{'content': 'Radiation dose is measured in \nSelect and explain. \nA. Roentgen, B. Sieve, C. Rem, D. Gray', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Units for Radiation dose or absorbed radiation are : Traditional unit : Rad SI unit : Gray', 'role': 'assistant'}]