What is meant by 'alternative methods' in the context of the 3Rs?

• A. Methods that replace animals or elicit information without using animals or reduce the number of animals used or refine procedures to reduce suffering
• B. Only computer modeling
• C. Only use fewer animals
• D. Replace animals with toxic substitutes

Answer: (A)

Alternative methods in this context mean approaches that reduce or avoid animal use while still obtaining the information needed. In the 3Rs, replacement means using non-animal systems when possible, reduction means using fewer animals, and refinement means modifying procedures to minimize pain and distress. The best description of alternative methods combines all three ideas: methods that replace animals or allow information to be obtained without animals, while also reducing the number of animals used and refining procedures to lessen suffering. Computer modeling is a good example of replacement, but it’s only one part of the broader concept. Saying only that fewer animals are used captures reduction alone, and replacing with toxic substitutes misses the humane, non-animal aim of the 3Rs.