Which MPEP sections relate to the "Obviousness" rejection?

The sections of the Manual of Patent Examining Procedure (MPEP) that relate to the "Obviousness" rejection are correctly identified in the answer. MPEP 706 provides guidance on the examination of applications, particularly the evaluation of claims and rejections; this section outlines the overall framework for how rejections based on various criteria, including obviousness, should be approached.

Sections 2141-2144 specifically focus on obviousness, detailing the legal standards and examination procedures. These sections elaborate on the rationale behind obviousness rejections, such as the application of the Graham factors, which include the determination of the scope and content of the prior art, the differences between the prior art and the claimed invention, and the level of skill in the art at the time of the invention.

These detailed guidelines help examiners formulate a consistent approach to deciding whether a claimed invention is obvious to a person having ordinary skill in the art, which is crucial in evaluating patentability. The specificity and relevance of these sections to obviousness make them the appropriate choice in this context.