'Flower' is related to its extractible 'Essence' (fragrance/oil) as an output of processing. In the same way, an 'Oven' is related to which output it produces?

Introduction / Context:
This is an input/device → produced output relation. Flowers can yield essence (perfume oil) through processing. An oven, when operating, produces heat to bake/cook. We must pick the direct output generated by the oven.

Given Data / Assumptions:

• Flowers → essence via extraction.
• Oven → heat for cooking/baking.

Concept / Approach:
Focus on the principal output/product. For ovens, heat is the operative output that causes the intended transformation of food.

Step-by-Step Solution:

Verification / Alternative check:
Some ovens may have flames (in gas types), but the functional output that matters is heat. Steam/vapour may occur with food, not from the oven per se.

Why Other Options Are Wrong:

• Vapour / Steam: By-products from food moisture, not the oven’s core output.
• Fire: A means (in gas ovens), not the intended controlled output.
• Light: Auxiliary illumination, not the cooking output.

Common Pitfalls:
Confusing incidental by-products with the primary generated output that accomplishes the task.

Final Answer:
Heat