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]: Math was the simple paper in the exam and Chemistry the difficult because the _ had a strict teacher.
[A]: Math


[Q]: Elaine took the painkillers that were in the medicine bottle for her back pain until the _ was empty.
[A]: bottle


[Q]: I used salt as a cleaning agent in my home instead of baking powder. The _ was white.
[A]:
baking powder