The Correct Answer is B
This is a common method of setting laboratory reference ranges. The result is that approximately 5% of healthy individuals will measure outside the reference range on any given test. Or, if 20 tests are performed on a healthy subject, the results of one of these tests will likely fall outside the reference range.
Ref: Rakel RE, Bope ET (eds): Conn's Current Therapy 2001. WB Saunders Co, 2001, p 1253.
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