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GATE 2025 BT – Question 39

General Biology · Immunology: MHC, antigen processing and presentation, regulation, tolerance, hypersensitivity, autoimmunity, immunodeficiency, graft vs host disease, vaccines · 2 marks · Multiple choice

Correctly match the type of Hypersensitivity reaction with its respective Example.

Hypersensitivity reactionExample
P. Type I1. Tuberculin reaction
Q. Type II2. Arthus reaction
R. Type III3. Chronic urticaria
S. Type IV4. Systemic anaphylaxis
  1. P-3; Q-4; R-2; S-1
  2. P-4; Q-3; R-1; S-2
  3. P-4; Q-3; R-2; S-1
  4. P-2; Q-3; R-4; S-1

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Correct answer: (C) P-4; Q-3; R-2; S-1

Explanation

Systemic anaphylaxis is a type I (IgE) reaction, chronic (autoimmune) urticaria is type II (antibody against receptors), the Arthus reaction is type III (immune complexes), and the tuberculin reaction is type IV (delayed, T-cell mediated).