You need to answer a given question containing a blank (_). Your answer must be one of the two objects mentioned in the question, for example "trophy" and "suitcase". Your answer must not contain a word that is not present in the question. Please don't use articles (e.g., the, a) before the answer.
Q: Andrew took notes and asked his teacher lots of questions in class, and he thought that the _ helped him prepare for the test.
A: 
notes