Odd-one-out (visualize a chair) Which word does NOT belong with the others? Choose the single best answer.

Introduction / Context:
This odd-one-out question focuses on furniture parts. Most terms name rigid, structural components commonly found on a wooden chair, while one names a soft, removable accessory. Distinguishing structural parts from accessories leads directly to the solution.

Given Data / Assumptions:

• Options: seat, rung, cushion, leg, backrest
• Assume a typical wooden chair construction with bracing members.
• Exactly one option should not be a fixed structural piece of the chair frame.

Concept / Approach:
Classify each item as structural (load-bearing or frame-related) or accessory (comfort or add-on). Structural parts are integral to the chair’s stability and function; accessories can be added or removed without compromising basic structure.

Step-by-Step Solution:

Verification / Alternative check:
Ask: If removed, does the chair still function as a chair? Removing cushion leaves a usable chair; removing seat, leg, backrest, or rungs can compromise function or safety. This confirms the classification.

Why Other Options Are Wrong:

• Seat: essential structural surface.
• Leg: essential load-bearing member.
• Backrest: standard structural support for the upper body (except on backless stools).
• Rung: structural bracing between legs increasing strength.

Common Pitfalls:
Confusing 'rung' solely with a ladder. In chair-making, rungs or stretchers are common structural braces connecting legs. The soft, removable nature of a cushion separates it categorically from the other hard, fixed components.

Final Answer:
cushion