Which one of the following types of pollination brings genetically different types of pollen grains to the stigma ?

(B) Xenogamy
Autogamy is the transfer of pollen grains from the anther to the stigma of the same flower, resulting in genetically identical offspring.
Geitonogamy is the transfer of pollen grains from the anther to the stigma of another flower of the same plant. Although it is functionally cross-pollination involving a pollinating agent, it is genetically similar to autogamy since the pollen grains come from the same plant.
Cleistogamy occurs in closed flowers which do not open at all, ensuring strict autogamy.
Xenogamy is the transfer of pollen grains from the anther to the stigma of a different plant. This is the only type of pollination which during pollination brings genetically different types of pollen grains to the stigma.