In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Sierra County has _ different regions.
[EX A]: two

[EX Q]: Allergic rhinitis is the most common allergic disease, with one in _ Canadian adults affected.
[EX A]: five

[EX Q]: Pups usually nurse for a year, but some continue to nurse for up to _ years.
[EX A]:
three