True/False: Some normative resources contain elements labeled as 'trial use'.

• A. True
• B. False
• C. Unclear
• D. N/A

Answer: (A)

Trial-use labeling in FHIR artifacts allows experimentation within a formally published standard. Even when a resource is normative—meant for stable, interoperable use—some of its elements can be marked as trial-use to test a proposed addition or change. This gives implementers a safe way to explore new capabilities, gather feedback, and refine the element before it becomes part of the normative specification. So, the statement is correct: normative resources can contain elements labeled as 'trial use.' When you see such elements, treat them as provisional and check the implementation guide for current guidance, since their status may evolve in future versions.