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
Collimating the X-ray beam reduces the formation of
scattered radiation by 
Select and explain. 
A. Selective removal of soft radiation, B. Selective removal of hard radiation, C. Reducing the size of X-ray beam, D. Reduction of beam intensity by 50%
C: Reducing the size of X-ray beam
Answer: C: Reducing the size of X-ray beam 
Explanation: None