What is the focus of 21 CFR parts 700s?

The correct answer is focused on cosmetic regulations, as 21 CFR parts 700 specifically address the regulation of cosmetics by the FDA. These regulations encompass various aspects, including labeling, safety, and the marketing of cosmetic products to ensure they are safe for consumer use. The laws set out guidelines for manufacturers to follow in order to prevent potentially harmful substances from being used in cosmetics and to provide consumers with adequate information about the products they use.

In contrast, the other categories covered by the remaining options involve different areas of FDA oversight. Medical device registration pertains to 21 CFR parts related to medical devices, which cover the approval and regulation processes for such products. Animal drug approval is, similarly, addressed by separate parts of the CFR that focus on veterinary medicines, while human subject protection is governed by regulations distinct from those overseeing cosmetics. Thus, 21 CFR parts 700's emphasis on cosmetics makes it uniquely applicable to that area of regulatory focus.