This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
Collimators in X ray Depament are used to: 
Select and explain. 
A. Reduce the radiation beam spread., B. Filter the radiation beam., C. Increase film latitude., D. Decrease film latitude.
A: Reduce the radiation beam spread.
Answer: A: Reduce the radiation beam spread. 
Explanation: Cones and Collimators are Lead Plates which prevent dispersion of X ray beam and give direction to the X ray Beam.