Some dietary supplements are packaged in containers with a "USP-verified makE." What is the role of the US Pharmacopoeia (USP) and thus indicated by this label?
A. To verify that the products listed on the label are accurate and pure
B. To market herbal products the have been FDA approved
C. To verify that the clinical claims made by the product are accurate
D. To ensure that herbal supplements will not interact with other medications