In the United States, marketing "healthy" food and supplements does not require demonstrated health benefits, though any specific health claim must be backed by scientific evidence. False and unsubstantiated advertising claims are investigated by the Federal Trade Commission $($FTC$).$

The makers of PomWonderful juice and POMx supplements had made a number of advertising claims such as "SUPER HEALTH POWERS! $100\%$ PURE POMEGRANATE JUICE. Backed by $$25$ million in medical research. Proven to fight for cardiovascular, prostate and erectile health." After conducting an investigation, the FTC ordered "POM's future disease treatment and prevention claims to be supported by at least one randomized, well$-$controlled human clinical trial."

$"$FTC complaint charges deceptive advertising by POM Wonderful," FTC$,$ September $27,2010.$

Explain the importance of a clinical trial being "well$-$controlled" in the context of POM products.

Well$-$controlled would mean that subjects are monitored and effects of POM products are recorded comprehensively.

Well$-$controlled would mean that POM products are carefully administered with amounts recorded for each subject.

Well$-$controlled would mean that POM products will be included in a massive study concerning the effect of various juices on health.

Wel$-$controlled would mean that POM products be used in a comparative experiment to evaluate health effects.