Antihistamine pills are used to nullify:

$A$ person shows strong unusual hypersensitive reactions when exposed to certain substances present in the air. Identify the condition. Name the cells responsible for such reactions. What precaution should be taken to avoid such reactions?

Which antibody is produced in large quantities during an allergic reaction?

What are substances that trigger an allergy called?

During an allergic reaction,the binding of antigens to $IgE$ antibodies initiates a response,in which chemicals cause the dilation of blood vessels and a host of other physiological changes. Such chemicals are

What is an allergy?