Which of the following sections is NOT amended by PD 498?

The correct choice highlights that Section 5 is not amended by PD 498, which is pertinent to understanding the legislative process and the specific changes that PD 498 brings to the existing law. PD 498 aims to modify certain sections of prior legislation, typically to update, clarify, or enhance the legal framework governing medical technology and its applications.

When looking closely at the context of PD 498, it is crucial to recognize which sections were specifically targeted for amendments. Knowledge of the specific contents of these sections helps in appreciating why some sections were left unchanged. Section 5, when reviewed, may have provisions considered stable or requiring no updates at the time of PD 498's enactment, distinguishing it from other sections that may have been outdated or in need of refinement.

In contrast, the other sections mentioned (11, 16, and 21) likely reflect aspects of the legal framework that either required modification to address emerging issues in the MedTech industry or to improve clarity in operational guidelines. Understanding these dynamics within the legislative context is essential for anyone studying MedTech laws and ethics.