Odd-one/analogy grouping – choose the profession in the same broad category: Carpenter, plumber, and electrician belong to a class of trades. Which option best matches this class?

Introduction / Context:
The question tests occupational classification by skill and mode of work. “Carpenter, plumber, electrician” are hands-on skilled trades working with materials, fixtures, and systems. We must pick another occupation of the same practical, manual craftsmanship family.

Given Data / Assumptions:

• Carpenter: woodwork and construction.
• Plumber: fluid systems and piping.
• Electrician: electrical wiring and systems.
• Candidates include both professional (white-collar) and manual (blue-collar) roles.

Concept / Approach:
Identify whether the work involves manual craftsmanship using tools and materials on site. A blacksmith works metal using forging and shaping – a traditional craft closely aligned with skilled trades. In contrast, doctor, professor, and lawyer are learned professions requiring formal licensure/academia but not manual tradecraft as the primary mode of work.

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• Doctor, Professor, Lawyer: Professional services, not manual crafts.
• Architect (added as a distractor): Design profession; does not practice hand fabrication as core work.

Common Pitfalls:
Equating “technical knowledge” with “trade.” The hallmark here is manual craft and on-site fabrication/installation.

Final Answer:
Blacksmith