instruction:
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.
question:
The horse ran faster on the track than in the field because the _ was more slippery.
answer:
field


question:
She counted her calories for her diet and found she needed more so she ate a brownie instead of an apple since the _ has fewer.
answer:
apple


question:
The skin treatment made her skin look better than the face mask did. The _ must work efficiently.
answer:

skin treatment