A Patient Asks Why the Blood Glucose Meter Directions State

A patient asks why the blood glucose meter directions state to wipe away the first drop of blood. The most informative response by the nurse would be:

A) "This eliminates microorganisms from the sample."
B) "The first drop is usually too small."
C) "The first drop is usually contaminated."
D) "The first drop has serous fluid that can dilute the specimen."