You are presented with the quiz "When cells start to divide uncontrollablly, they may form a what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cells that divide uncontrollably may form a tumor, or abnormal mass of cells" and "for example, a fibroid is a tumor, a wart is a tumor, and cancers are tumors". 

So, what's the best answer to the question?


 

      fibroid     