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.

[EX Q]: The weightlifter felt a lot more tough when working with barbells than with kettlebells, because the _ worked more complex muscle groups.
[EX A]: barbells

[EX Q]: The shrub needed to be pruned more than the tree because the _ had more leaves.
[EX A]: shrub

[EX Q]: I've always wanted to write a book a mystery or crime book. The _ book would be based on my mischievous days.
[EX A]:
crime