Answer:
This is considered an unexpected problem without an adverse event.
Explanation:
During scientific research many variables must be considered, but not only during laboratory testing.
Many times we may have unforeseen events in the subject's life, such as delays, accidents or not following the protocol required by the tests.
In this case there was a lack of monitoring of the subject that could have been done by phone or even email, it is important to anticipate any possible event that disrupts the research, as it could cost the lives of people.
