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
[{'content': 'Collimators in X ray Depament are used to: \nSelect and explain. \nA. Reduce the radiation beam spread., B. Filter the radiation beam., C. Increase film latitude., D. Decrease film latitude.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cones and Collimators are Lead Plates which prevent dispersion of X ray beam and give direction to the X ray Beam.', 'role': 'assistant'}]