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


[Q]: The chain on the bike was rustier than the one on the trike because the _ was kept under the patio.
[A]: trike


[Q]: The horse needed special medication for its skin to treat the parasite that it was infected with, because the _ was inflamed.
[A]:
skin