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 a device which is used for: 
Select and explain. 
A. Reducing scattered radiation, B. Reducing patients exposure time, C. Reducing the contrast of the X-ray, D. All of the above
A: Reducing scattered radiation
Answer: A: Reducing scattered radiation 
Explanation: Ans. Reducing scattered radiation