Replacement in animal research refers to which practice?

• A. Replacement
• B. Reduction
• C. Refinement
• D. Animal Welfare

Answer: (A)

Replacement means using non-animal methods in place of animal experiments whenever possible. It’s one of the 3Rs guiding humane research—substituting alternatives like in vitro systems (cell cultures, organoids), computer simulations and models, or studies with human data and tissues when they can answer the question without animals. The idea is to avoid animal use altogether when feasible. The other terms refer to different aims: Reduction is about using fewer animals, Refinement focuses on minimizing pain and distress in procedures, and Animal Welfare is a broad concern for humane treatment rather than a specific substitution strategy.