Which of the following types of organs are categorized as adjacent organs?

Adjacent organs are defined by their physical proximity to one another in the body's anatomy, specifically being in close contact or touching. Unnamed contiguous organs fit this definition perfectly because they refer to organs that are adjacent based on their location, regardless of whether they have specific names or specialized functions.

In contrast, organs with specialized functions can be situated apart from each other based on their roles in the body and do not necessarily define adjacency. The inclusion of both unnamed and named organs does not emphasize the crucial factor of physical proximity, as it's possible for named organs to be less contiguous based on their anatomical arrangement. Finally, focusing only on larger anatomical structures could exclude smaller, yet adjacent, organs which play equally important roles in bodily function. Therefore, the definition of adjacent organs lies best with unnamed contiguous organs, as they inherently capture the essence of what it means to be adjacent based solely on their anatomical positioning.