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
Which of the following best estimated the amount of radiation delivered to an organ in the radiation field – 
Select and explain. 
A. Absorbed dose, B. Equivalent dose, C. Effective dose, D. Exposure dose
A: Absorbed dose
Answer: A: Absorbed dose 
Explanation: The total quantity of radiation delivered / deposited to an organ is defined as the absorbed dose.