Which of the following statements are correct for allergies?

(I) The exaggerated response of the immune system to certain antigens present in the environment is called allergy.

(II) Allergens are mites in dust, pollens and animal dander.

(III) Symptoms include sneezing, watery eyes, running nose and difficulty in breathing.

(IV) It is due to the release of chemicals like histamine from the monocyte cells

(V) The use of drugs like anti- histamine, adrenaline and steroids quickly reduce the symptoms of allergy.

(VI) The antibodies produced to these are of IgM type.