Answer:
immediate hypersensitivity is a correct answer.
Explanation:
Allergy to pollen is classified as immediate hypersensitivity.
Immediate hypersensitivity is a type I hypersensitivity induced by an antigen called allergens like dust, pollen grains, etc.
Immediate hypersensitivity is a type of allergic reaction.
It occurs through the exposure to allergen by inhalation, through direct contact or by ingestion.
Thus Allergy to pollen is classified as immediate hypersensitivity and it is IgE mediated allergic reaction.
