Antihistamines and steroids are administered to treat which of the following?

$A$ person shows symptoms like sneezing,watery eyes,running nose,and difficulty in breathing upon exposure to certain substances in the air. Which type of antibody is produced during such a condition?

$A$ non-infectious,unnatural,and unusual reaction of a person to any substance or condition for which they are hypersensitive is termed as:

Which chemicals produced by mast cells are responsible for allergy?

Anaphylactic shock is due to

Select the incorrect statement $w.r.t.$ allergy.