Question

1. how long do you have to use a test strip once it is removed from container?

a. 5 minutes.
b. 10 minutes.
c. 1 hour.
d. can be used anytime.

Explanation:

The question is about the usage time of a test strip after removal from its container. In medical or health - related contexts (under Natural Science, subfield Medicine and Health), test strips (like for glucose testing etc.) are designed to be used promptly but some may have a short window, but in this case, the selected option is d. Can be used anytime, which might be a specific case for this particular test strip type.

Answer:

d. Can be used anytime.