Initial animal studies for drug safety evaluation.

• A. Phase 1 clinical trials
• B. Preclinical testing
• C. NDA
• D. IND

Answer: (B)

Preclinical testing, which includes initial animal safety studies, evaluates the safety profile of a drug before it is tested in humans. In this stage, researchers perform toxicology, pharmacokinetics, and pharmacodynamics studies in animals to identify potential risks, determine safe starting doses, and establish safety margins. The results help decide whether it is appropriate to move into human trials and form the basis for regulatory submissions.

Phase 1 clinical trials are the first exposure of humans to the drug and focus on safety, tolerability, and basic pharmacokinetics in people. An Investigational New Drug application is the regulatory request to begin human studies, not the animal work itself. A New Drug Application is the later submission seeking marketing approval after successful human trials.