Final answer:
The statement that requires correction is number 4: MedWatch ensures all medications on the market undergo rigorous testing before they are sold.
Step-by-step explanation:
The statement that requires correction is number 4: MedWatch ensures all medications on the market undergo rigorous testing before they are sold. MedWatch is a reporting program established by the US Food and Drug Administration (FDA) that allows healthcare personnel to report adverse effects of medicines, but it does not directly ensure rigorous testing of all medications before they are sold. The FDA, on the other hand, is responsible for regulating and monitoring the safety and efficacy of medications in the United States. They review data from clinical trials conducted by drug manufacturers to determine the safety and effectiveness of new medications before approving them for sale.