Which structure of a flower releases pollen?

anther

sepal

pistil

ovary

Anther

Explanation:

The anther is the structure within the flower that makes the pollen and later releases it. The sepal is the part of the flower that protects developing flowers; leaf-like. The pistil (aka carpel) consists of the stigma (pollen landing site), style (elevates stigma to aid in pollination; connects ovary), and ovary. The ovary is what surrounds the ovule/seed of the plant.