Odd One Out — Mustard, Sesame, and Olive are primarily grown/used as oil-yielding crops; Corn is chiefly a cereal (monocot) grain. Identify the odd item.

Introduction / Context:
Crop classification can consider primary agricultural purpose. Three items are classic oil sources; one is chiefly a cereal grain in agronomy and human diets.

Given Data / Assumptions:

• Mustard: oilseed (edible mustard oil).
• Sesame: oilseed (sesame oil).
• Olive: fruit oil (olive oil).
• Corn (maize): cereal grain; although corn oil exists, the primary classification is cereal/food/feed.

Concept / Approach:
Choose by dominant agricultural category: oilseed/fruit-oil vs cereal grain.

Step-by-Step Solution:
Mustard → oilseed.Sesame → oilseed.Olive → oil-bearing fruit.Corn → cereal (monocot grass); not primarily categorized as an oil crop.

Verification / Alternative check:
Taxonomy: corn is a Poaceae monocot; mustard/sesame are dicots; olive is a dicot tree; monocot vs dicot distinction also isolates corn.

Why Other Options Are Wrong:

• Mustard, Sesame, Olive: commonly grouped as oil-yielding crops.

Common Pitfalls:
Overemphasizing secondary products (e.g., corn oil) when the primary agronomic class is cereal grain.

Final Answer:
Corn