Which part of the stamen includes the filament?

The filament is a crucial part of the stamen, which is the male reproductive structure of a flower. The stamen consists of two main components: the anther and the filament. The filament is the slender stalk that elevates the anther, allowing it to be more accessible for pollinators and facilitating the distribution of pollen.

In this context, the anther is specifically where pollen grains are produced and stored. Understanding this relationship is essential, as the filament supports the anther but does not include it. The other choices like the ovary and style are parts of the female reproductive structure, while pollen refers to the male gametes produced in the anther. Thus, the correct choice, which identifies the stamen along with the filament, is the anther.