Which option best captures the pharmacodynamics/pharmacokinetics distinction; receptor affinity impact.

• A. Pharmacokinetics describes the body's effects on drugs; pharmacodynamics describes ADME.
• B. Pharmacodynamics is about drug interactions with enzymes; pharmacokinetics describes ADME.
• C. Higher receptor affinity always yields a weaker effect.
• D. Pharmacodynamics involves receptor interactions, and higher receptor affinity typically yields a stronger or more potent effect.

Answer: (D)