Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Fact: each of the moon 's phases usually occurs once per month. Question: A boy is waiting to see a full moon. He notes that the full moon is tonight, and looks at it. If he wants to see another, he must wait?
Student:
a month