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: grey clouds are a source of precipitation. Question: Above your head, the daylight sky is gloomy and dark, despite the hour of day. The wisest thing to bring with you on this summer afternoon is?
an umbrella