Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: The man poured some cereal. He got out the milk. It smelled sour. He poured out the milk. He put water on his cereal.
 selected sentence: It smelled sour.

The milk is expired >Causes/Enables> The milk smells sour