During an allergic condition,which hormone is secreted?

Which cells are associated with allergies?

Which of the following substances are included as allergens?

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.

Allergy is due to the release of chemicals like $...$ and $...$ from the $...$ cells.

Which type of antibody is produced during an allergic reaction?