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
Curie is unit for: 
Select and explain. 
A. Exposure, B. Absorbed dose, C. Degree of potential danger to health, D. Quantity of radionuclide disintegrating per second
D: Quantity of radionuclide disintegrating per second
Answer: D: Quantity of radionuclide disintegrating per second 
Explanation: Ans. Quantity of radionuclide disintegrating per second