Which of these is not botanically a fruit?

Botanically speaking, a fruit is a seed-bearing part of the plant that develops from the ovary of a plant, whereas vegetables are all other plant parts, such as roots, leaves and stems. By those standards, seedy outgrowths such as apples, squash, cucumbers, avocados, tomatoes are all fruits, while roots such as radishes, beets, potatoes and turnips, leaves such as spinach, kale and lettuce, and stems such as celery and broccoli are all vegetables.

In culinary terms, however, there are differing opinions as to what is a fruit or vegetable. A lot of foods that are (botanically speaking) fruits, but which are savory rather than sweet, are typically considered vegetables by chefs. This includes such botanical fruits as eggplants, bell peppers and tomatoes and other salad 'vegetables'. And vice versa some vegetables are used as fruit for example rhubarb.

The fruit vs. vegetable has and does cause a lot of debate splitting opinions which have resulted in court battles. For example, in the 1893 United States Supreme Court case Nix. v. Hedden, the court ruled unanimously that an imported tomato should be taxed as a vegetable, rather than as a (less taxed) fruit. The court acknowledged that a tomato is a botanical fruit, but went with what they called the "ordinary" definitions of fruit and vegetable were the ones used in the kitchen.