Answer the following question given this paragraph: 

When you think of muscles, you might think of biceps and the external muscles you see in a bodybuilder. However, some muscles are found deep inside your body. The heart, for example, is a very muscular organ. It has to pump blood all around your body.


Q: Which muscular organ pumps blood all around your body?

 Choices:

- stomach

- lungs

- pancreas

- heart

A:
heart
