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.

Example Input: She wondered if the schedules or the classes would lead to the most discipline, but the _ had the most effect.
Example Output: classes

Example Input: Bill got a new king sized mattress but had to throw out his old queen bed frame because the _ was larger.
Example Output: mattress

Example Input: Swimming was forbidden in the pool, but allowed in the lake, because the _ was safe.
Example Output:
lake