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

How can allergies be detected in a patient?

In the metropolitan cities of $India$,many children are suffering from allergy/asthma. What are the main causes of this problem? Give some symptoms of allergic reactions.

In allergy and urticaria,the local arterioles dilate due to an increased substance released from mast cells,called:

The function of $IgE$ is

Which immunoglobulin is associated with allergic reactions?