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
Best method for dosimetry is: 
Select and explain. 
A. Film badges, B. Thermoluminescent dosimetry, C. Ionization chamber, D. All of the above
C: Ionization chamber
Answer: C: Ionization chamber 
Explanation: None