Which psychological marketing principle is most effectively used by pharmaceutical companies to increase medication adoption among physicians?

The pharmaceutical industry spends billions on marketing strategies that shape how we perceive medications. Beyond the science, successful medications rely heavily on consumer psychology and brand positioning. This poll tests your knowledge of how psychological principles are applied in pharmaceutical marketing to influence both doctors and patients. Can you identify the proven psychological technique that drives prescribing behavior?

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The Scarcity Effect - limiting access to drug samples to create perceived value
Social Proof - using respected Key Opinion Leaders (KOLs) to endorse medications to their peers
Color Psychology - exclusively using blue packaging to evoke feelings of trust and efficacy
The Primacy Effect - prioritizing medication presentations at the beginning of medical conferences