Definition: You are given a sentence and a question in the input. If the information provided in the sentence is enough to answer the question, label "Yes", otherwise label "No". Do not use any facts other than those provided in the sentence while labeling "Yes" or "No". There are only two types of valid responses: Yes and No.
Input: Sentence: He had waited at the door for four whole hours, but was afraid to knock in case the noise would wake the humans. 
Question: What won't happen if the elf doesn't help the Tooth Fairy on his first day of work?

No.