Identify the odd one out.

Looking at the options, we can see that a carrot is a type of vegetable, and an apple is a type of fruit. Tubers are essentially plant parts that are enlarged to form storage containers that plants use to hold nutrients. This allows them to feed their offspring or survive through the winter. Potatoes are a form of stem tuber.

This leaves us with tomato. Tomatoes are used in making salads and are a part of salads, but they are not a type of salad.

Hence, the tomato is the odd one out among the given options. 

Therefore, option A is the correct answer.