Supposed that the drugs below were administered at the same dosages, which of the following has the highest fraction/concentration in the central compartment?
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A. Drug A - 40% peripheral tissues, 60% systemic circulation (20% protein bound, 40% unbound)
B. Drug B - 40% peripheral tissues, 60% systemic circulation (45% protein bound, 15% unbound)
C. Drug C - 70% peripheral tissues, 30% systemic circulation (10% protein bound, 20% unbound)
D. Drug D - 20% peripheral tissues, 80% systemic circulation (30% protein bound, 50% unbound)