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
On taking X-ray, Grid is placed: 
Select and explain. 
A. Behind the film and in front of the patient, B. Behind the patient and in front of the film, C. Behind the film and lateral to the patient, D. Behind the patient and lateral to the film
B: Behind the patient and in front of the film
Answer: B: Behind the patient and in front of the film 
Explanation: 'Grids' are placed between the patient and the 'x-ray' film to reduce the scattered radiation from forming the image and thus improve image contrast. They are made of parallel strips of lead with an inter-space having aluminum or organic spacer and prevents scatter radiation from forming the image while allowing the straight beam to pass.