Question

what is allergens ?and how many types of allergens are there ?

Answer 1

Allergens are the substances that cause excessive immune response e.g pollen grains,insect sting, moulds,dust, food ect.

Answer 2

Answer:

Subtances in any form that cause allergy are called allergens

There are many types of allergens some are

example:

food: milk, nuts, ghee etc

dust, dander,pollen

sunlight, chemicalsetc