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]: 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]: To clean my floors I use a broom and sometimes also use a mop, since I want to be thorough today I am using the _ on the floor.
[A]: mop


[Q]: If you're interested in alpha hydroxy acid for skincare, I'd recommend starting with our cream rather than our serum since the _ is harsher.
[A]:
serum