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]: The drifter pulled out his harmonica while riding the train and played a tune over the _ noise.
[A]: train


[Q]: Preston liked learning violin better than piano at music class, because the _ hurt his back.
[A]: piano


[Q]: The dog wanted to stay in the park and not go back to the house because the _ was too small.
[A]:
house