Question

The type of hypersensitivity reaction that is dependent on IgE-mediated activation of mast cells and basophils and the subsequent release of chemical mediators of the inflammatory response is known as which of the following types of hypersensitivity reaction?
(A) Type 1 Hypersensitivity
(B) Type II Cytotoxic Hypersensitivity
(C) Type III Immune Complex Hypersensitivity
(D) Type IV Delayed-Type Hypersensitivity

Answer 1

Answer: Option A."Type 1 Hypersensitivity"

Explanation:

Hypersensitivity reaction can be defined as the reaction produced by normal immune system in response to any foreign substance such as allergies as the protection barrier for body.

Type I hypersensitivity reaction is also known as  immediate hypersensitivity reactions that involves immunoglobulin E (IgE)–mediated activation that release histamine or other mediators from basophils and mast cells.

Thus the correct option is A.