Which advertising technique is uniquely BANNED for prescription drugs in the United States but commonly permitted in most other countries?

In the pharmaceutical industry, advertising of prescription medications is subject to strict regulations that vary by country. These rules aim to balance pharmaceutical companies' need to market products with consumer protection and ethical considerations. How well do you understand the unique restrictions that shape medical product advertising strategies worldwide?

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Direct-to-consumer (DTC) television advertisements
Comparative pricing claims against competitor medications
Celebrity physician endorsements in medical journals
Free prescription drug samples to healthcare providers