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 overall degree of darkness of an exposed film is known as: 
Select and explain. 
A. Radiographic contrast, B. Radiographic density, C. Brightness, D. Exposure
B: Radiographic density
Answer: B: Radiographic density 
Explanation: None