CITI Training Practice Exam 2025 – Comprehensive Test Prep

Long-term toxicology studies in animals are conducted during the preclinical phase of drug development. This is the phase before the drug is tested on human subjects during clinical trials. Option A, Discovery, is incorrect because this phase involves identifying a potential drug candidate. Option C, Clinical, is incorrect because this phase involves testing the drug on human subjects. Option D, Post-marketing surveillance, is incorrect because this phase occurs after the drug has already been approved for use and is on the market.