Given the task definition and input, reply with output. In this task, you are given a fact statement and question based on the fact. Your task is to generate the correct answer for the question. The answer needs to be generated using the context fact statement.

Fact: microorganisms cause food to spoil. Question: A team has pizza after a game, and they eat most of it, but leave the rest of the pizza out. The pizza is later inedible because of?

lack of food preservation