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6560 Pharmacology

All of the following statements regarding bioavailability of a drug are true except:

AIt is a fraction of administered drug that reaches the systemic circulation in unchanged form
BBioavailability of an orally administered drug can be calculated by comparing the Area Under Curve after oral and intravenous administration
CLow oral availability always and necessarily means poor absorption (Correct Answer)
DBioavailability can be determined from plasma concentration or urinary excretion data.