Answer the following question given this paragraph: 

Look at the classroom in Figure below . It has several sources of visible light. One source of visible light is the sun. Sunlight enters the classroom through the windows. The sun provides virtually all of the visible light that living things need. Visible light travels across space from the sun to Earth in electromagnetic waves. But how does the sun produce light? Read on to find out.


Q: Lead shielding is used to block what type of rays?

 Choices:

- ultraviolet

- alpha

- toxic

- gamma

A:
gamma
