Classification (materials vs finished structure): Three options are building materials; one option is a completed structure/thing made from materials. Identify the odd one out.

Introduction / Context:
Reasoning sets often contrast raw inputs with finished outputs. Sand, cement, and wood are standard construction materials, while a building is a completed structure that uses such materials. The task is to select the item that is not itself a material but the result of using materials in construction, creating a straightforward odd-one-out decision grounded in everyday knowledge.

Given Data / Assumptions:

• Sand → granular material used in concrete/mortar.
• Cement → binder used to form concrete/mortar.
• Wood → structural/finishing material.
• Building → constructed structure composed of materials.

Concept / Approach:
Group by production role: input vs output. The single finished product (building) differs categorically from the other items (inputs), making it the clear odd item for classification purposes.

Step-by-Step Solution:

Verification / Alternative check:
Try the “is made from” test: a building is made from sand/cement/wood; the materials are not “made from” a building.

Why Other Options Are Wrong:

Common Pitfalls:
None significant; this is a direct materials-versus-finished-goods contrast.

Final Answer:
Building