The document discusses a sample question from the PMP exam about Work Breakdown Structure (WBS) quality principles. The question asks about the two sub-principles of WBS Quality Principle 1, and the correct answer is C - Core Characteristics and Use-Related Characteristics. The hint notes that PMI acknowledges WBS Quality Principle 1. The answer section explains that these sub-principles are outlined in a separate PMI document on WBS quality principles. It also notes that obscure questions like this may appear on the exam.