Which type of antibody is produced in response to allergens?

Antihistamine pills are used to nullify:

$IgE$ is responsible for:

When a person dies after being stung by a bee followed by the administration of penicillin,the death may be due to:

Which chemicals released from mast cells are responsible for allergic reactions?

Assertion : Mast cells in the human body release excessive amounts of inflammatory chemicals,which cause allergic reactions.
Reason : Allergens in the environment on reaching human body stimulate mast cells in certain individuals.