Which module maintains the most basic documentation for the FHIR specification?

• A. Foundation Framework
• B. Foundation module
• C. Implementation Support Module
• D. Security and Privacy Module

Answer: (B)

Foundation module defines the core data types and base structures used across the entire FHIR specification. It provides the building blocks that every resource and profile relies on, such as Element, BackboneElement, Resource, and the primitive datatypes. Because it sets up this foundational vocabulary and structure, it holds the most basic documentation that underpins the entire spec. The other modules focus on specific domains or guidance—security and privacy considerations, or implementation support and tooling—without defining those core concepts. So this module is where the essential baseline documentation lives, making it the best fit.