The correct option is A Asclepiadaceae
A pollinium is a coherent mass of pollen grains in a plant that are the product of only one anther (pollen-producing reproductive organ of the flower) but is transferred, during pollination, as a single unit. This is regularly seen in many species of milkweeds. The pollen grains are found in a sac-like structure called pollinium. It is found in family Asclepiadaceae.