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
Most accurate method of measuring radiation dose is: 
Select and explain. 
A. Film badges., B. Thermoluminescent dosimeter., C. Ionization chamber., D. All of the above.
C: Ionization chamber.
Answer: C: Ionization chamber. 
Explanation: None