Pharmacogenetics studies inherited differences in metabolism and effect; which option best describes this concept?

• A. Absorption rate with food
• B. Inherited difference in metabolism and effect
• C. Study of pharmacokinetics in populations
• D. Drug development process

Answer: (B)

Pharmacogenetics examines how inherited genetic variations change the way a drug is metabolized and the response it produces. This directly describes differences in metabolism and effect that are passed down genetically, which is why the option describing an inherited difference in metabolism and effect is the best fit. For instance, some people carry variants in metabolic enzymes like CYP450 that speed up or slow down drug clearance, leading to higher or lower drug levels and different clinical effects. Other choices describe non-genetic factors or broader fields (absorption with food, general pharmacokinetics in populations, or the drug development process), which don’t capture the heritable aspect that defines pharmacogenetics.