Answer the following question given this paragraph: 

A spiral galaxy is a rotating disk of stars and dust. In the center is a dense bulge of material. Several spiral arms come out from the center. Spiral galaxies have lots of gas and dust and many young stars. The image below ( Figure below ) shows a spiral galaxy from the side. You can see the disk and central bulge.


Q: What is the term for a galaxy that is a rotating disk of stars and dust?

 Choices:

- cosmic galaxy

- nebula

- Milky Way

- spiral galaxy

A:
spiral galaxy
