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 best estimated the amount of radiation delivered to an organ in the radiation field – \nSelect and explain. \nA. Absorbed dose, B. Equivalent dose, C. Effective dose, D. Exposure dose', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The total quantity of radiation delivered / deposited to an organ is defined as the absorbed dose.', 'role': 'assistant'}]