You are presented with the quiz "Cells that divide uncontrollably may form _." 

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 "tumor Tumors are masses of neoplastic origin". 

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


 

  masses of neoplastic origin         