In this task you are given a story and a question regarding that story. You must judge whether the question is answerable based on the info given to you. Label the instances as "Answerable" or "Not Answerable" based on your judgment. the story and the question are separated by a new line character.

Let me give you an example: Bob was a computer scientist. He enjoyed natural language processing. He decided to revolutionize the industry! He formulated a machine learning algorithm to process words. He won the nobel prize for his work!
Why did He formulate a machine?
The answer to this example can be: Answerable
Here is why: He formulated a machine learning algorithm to process words.

OK. solve this:
Mrs Winters gathered her class around. They got off the bus and began walking towards the museum. They were going to see several exhibits that day. The children were excited and also were able to learn a lot. It was a very successful field trip for the class.
Why was It a very successful field trip for the class?
Answer:
Answerable