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
Walls of the CT scanner room are coated with: 
Select and explain. 
A. Lead, B. Glass, C. Tungsten, D. Iron
A: Lead
Answer: A: Lead 
Explanation: Shielding refers to use of any type of material to decrease radiation that reaches an area. The material most commonly used is lead, such as lead-lined gloves and lead aprons. Other materials such as concrete walls are capable of shielding. Ref: Essentials of Nursing : Care of Adults and Children By Barbara Kuhn Timby, Nancy Ellen Smith, Page 278