The correct answer is option 3: Anther. The anther is a floral part that plays a vital role in reproduction. It is responsible for producing pollen grains, which contain the male gametes of the plant. The pollen grains are released from the anther and are transferred to the stigma of the same or another flower, where fertilization takes place. Sepals are typically green, leaf-like structures that protect the developing bud, while petals are the colorful, often attractive parts of the flower that help attract pollinators. The ovary is the female reproductive part of the flower that contains the ovules, which develop into seeds after fertilization. Therefore, the anther is the specific floral part that produces pollen grains.