Which option correctly describes the difference between a generic drug name and a brand name, and why equivalence matters?

• A. Generic is the trademarked name; Brand is the official nonproprietary name; Equivalence is essential
• B. Brand name is the official nonproprietary name; Generic is the trademarked name; Equivalence matters for safety and efficacy
• C. Brand name and generic are the same; no difference
• D. Generic is the official nonproprietary name; Brand is the trademarked name by the manufacturer; Equivalent bioavailability and therapeutic effect are essential

Answer: (D)