Teacher: You are given a sentence from a conversation between a human and a virtual assistant. Your task is to identify whether the sentence is a question or not. Answer with Yes or No.
Teacher: Now, understand the problem? If you are still confused, see the following example:
I am feeling hungry so I would like to find a place to eat.
Solution: No
Reason: The user is informing the intent, but not asking any question here

Now, solve this instance: What number can they be reached at?
Student:
Yes