Answer the following question given this paragraph: 

In panel A, an abnormal cell (2) is prevented from dividing, and the abnormal cell dies (1). In panel B, an abnormal cell is not prevented from dividing. Instead, it divides uncontrollably, leading to the formation of a tumor.


Q: If an abnormal cell is not prevented from dividing and it divides uncontrollably, what forms?


A:
tumor