Respuesta :
Answer:
Sensitization.
Explanation:
Hypersensitive reaction may be defined as the exaggerated or hyper response of the immune system. Hypersensitive reactions can occur due to auto immunity and allergies.
Type I hypersensitive reaction is mainly mediated by IgE antibodies. The sensitization towards particular stimuli like pollen grains may exaggerate the Type I hypersensitive reaction.
Thus, the correct answer is option (1).
Response when there is undesirable and unnecessary body immune change is called hypersensitivity. Type I hypersensitivity requires sensitization.
What is Type I hypersensitivity?
The immediate reaction of the antibodies against the allergens involving immunoglobin E is called type I hypersensitivity. They are immediate reactions and are responses to allergic reactions and atopic diseases.
This type of hypersensitivity is majorly mediated by immunoglobin E and is an exaggerated or hyper response of the antibodies.
The primary event that is required for the start of the type I hypersensitivity reactions is the sensitization of the body cells towards the pollen or allergic particles.
Therefore, option A. sensitization is the initial primary event.
Learn more about hypersensitivity here:
https://brainly.com/question/12331640
