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
The fastest dental film currently available has the speed
rating of 
Select and explain. 
A. "D" speed, B. "C" speed, C. "F" speed, D. "E" speed
C: "F" speed
Answer: C: "F" speed 
Explanation: None