Final answer:
A medical evaluation prior to respirator use ensures the user is fit and must be done before using a respirator for the first time.
Step-by-step explanation:
The correct answer is option D: A and B are true. A medical evaluation prior to respirator use ensures that the respirator user is fit to use a respirator and must be done prior to using a respirator for the first time. It is not necessary to complete a medical evaluation every 6 months.
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