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
Grid is used in radiography to: 
Select and explain. 
A. Reduce KVP, B. Reduce exposure time, C. Reduce fogging, D. None of the above
C: Reduce fogging
Answer: C: Reduce fogging 
Explanation: None