Answer the following question given this paragraph: 

Mutations that lead to cancer usually occur in genes that control the cell cycle. These include tumor-suppressor genes and proto-oncogenes.


Q: Mutations that lead to cancer usually occur in genes that control the cell cycle. these include tumor-suppressor genes and what?

 Choices:

- extinction - oncogenes

- apparition - oncogenes

- Darkness Oncogenes

- proto-oncogenes

A:
proto-oncogenes
