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]: He used a harness instead of a collar on his dog because the _ didn't choke the dog when it pulled.
[A]: harness


[Q]: Mary was unsure if the spot on the couch was from the pen or marker, then she realized it couldn't be the _ because the cap was on.
[A]: marker


[Q]: The door failed to mesh with the new house's frame because the _ was stable.
[A]:
frame