During allergic reactions, which of the following are secreted?
(A) Histamines
(B) Interferons
(C) Serotonin
(D) Pyrogens
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A) and (C) only
(A) Histamines — Correct. Histamine is released by the mast cells in an allergic reaction. It causes sneezing, watery eyes and a running nose. That is why anti-histamine drugs relieve allergy.
(B) Interferons — Incorrect. Interferons are proteins made by cells infected with a virus. They protect the nearby cells from further viral infection. They are a part of innate immunity, not of allergy.
(C) Serotonin — Correct. Serotonin is the second chemical released by the mast cells along with histamine during an allergic reaction.
(D) Pyrogens — Incorrect. Pyrogens are substances that cause fever, as during an infection. Fever is not a symptom of allergy.
Note: The same question was also asked in CUET (UG) 2025 on 03-06-2025 (Slot 2).
NCERT Extract:
Allergies –
