The inflammatory substance produced during allergic reactions by mast cells is:

Which of the following substances are included as allergens?

What is the term for the exaggerated response of the immune system to certain antigens present in the environment?

$A$ person is suffering from frequent episodes of nasal discharge,nasal congestion,reddening of eyes,and watery eyes. These are the symptoms of

Which drugs quickly reduce the symptoms of allergy?

Which of the following is a severe allergic reaction?