You are presented with the quiz "If a tumor has formed, this gene might have mutated:" 

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 "when p53 is mutated, cells divide uncontrollably". 

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


 

 p53          