Concept:
To find the odd one, we must check whether the example belongs correctly to the given category.
• Fruit -- tomato (accepted as fruit botanically)
• Pen -- Natraj (correct brand example)
• Non-veg -- tofu (incorrect because tofu is vegetarian)
• Bike -- Splendor (correct example)
Step 1: Analyze each pair.
Fruit : Tomato
Tomato is scientifically a fruit.
Pen : Natraj
Natraj is a pen brand.
Step 2: Check the third pair carefully.
Non-veg : Tofu
Tofu is made from soybeans, so it is:
Vegetarian
This does not match.
Step 3: Verify the fourth pair.
Bike : Splendor
Splendor is a bike model.
Step 4: Final conclusion.
Only one pair is mismatched:
\[
\boxed{\text{Non-veg -- tofu}}
\]
Hence, it is the odd one.