Which of the following is NOT a fruit type?

In botanical classification, fruit types are categorized primarily into three main categories: simple, aggregate, and multiple fruits. Each of these categories describes a different formation process of fruits that arise from flowers.

Simple fruits develop from a single ovary and can be fleshy or dry, representing a straightforward fruit development process. Aggregate fruits form from multiple ovaries of a single flower, combining to create one fruit, such as raspberries. Multiple fruits, on the other hand, form from the ovaries of multiple flowers that are closely packed together, as seen in pineapples.

The term "complex" does not fit into this classification of fruit types. It lacks a defined botanical meaning related to the structure or formation of fruits. As a result, understanding the correct classifications of fruits allows for better insight into plant reproduction and anatomy, making it clear that "complex" is not an accepted fruit type within this classification system.