This is adrug/device accountability calculation question, testing compliance with investigational product tracking.
* The subject was instructed to perform4 glucose checks per day.
* Over10 days, that equals40 tests (4 × 10 = 40).
* Each test requires1 strip, so40 strips used.
* Subject was given45 strips, leaving5 unusedafter 10 days.
Investigators are responsible for maintaining accurate device/product accountability.
* ICH E6(R2) 4.6.3:"The investigator/institution should maintain records of the product's delivery to the trial site, the inventory, the use by each subject, and the return to the sponsor or alternative disposition."
* This ensures monitoring can confirm that product/device use aligns with the protocol and subject adherence.
Thus, the correct answer isB (5 unused test strips).
References:
ICH E6(R2), §4.6.3 (Investigational product accountability).