What is cancer?

A.) addition of new cells to replace damaged cells

B.) DNA replication

C.) cellular death

D.) uncontrolled cell division

Cancer is D. uncontrolled cell division. It happens sometimes that cells in a body start dividing uncontrollably, and cannot be stopped unless strong drugs are used, or a person is taken to the hospital to have the organ removed, if that is possible. These cells spread throughout a body or an organ, infecting it, and creating a cancer.