In the drug development process, which sequence is most accurate?

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In drug development, stages unfold in a logical flow from ideas to real-world use. Discovery identifies potential targets and candidate compounds that could become medicines. After this, preclinical work and regulatory steps allow testing in humans through clinical trials, which are designed to assess safety and efficacy in people. Only once sufficient evidence is gathered do regulators consider approval to market the drug. After approval, pharmacovigilance monitors safety in the broader patient population.

That sequence—starting with discovery and moving into human trials to evaluate safety and efficacy—is the best fit because trials depend on having a candidate from discovery, and the later steps (regulatory approval and post-marketing safety monitoring) occur after those trials. The other options place processes in the wrong order or reflect steps that happen later in the lifecycle (pharmacovigilance and regulatory approval) before discovery or before trials.