Biology Immunity SZABMU 2024
PMDC Verified Question 65 of 99
Which of the following chemicals is responsible for causing inflammation in upper respiratory tract?
A
Acetyl amine
B
Ampicillin
C
Histamine
D
Nicotine
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Histamine
Concept:

Allergic and inflammatory responses in mucosal tissues are driven by mast cell degranulation.

Formula:

None

Solution:

  • When allergens (like pollen) enter the upper respiratory tract, they bind to IgE antibodies on local mast cells.


  • This triggers the massive release of histamine.


  • Histamine binds to local H1 receptors, causing aggressive vasodilation and mucus hypersecretion, resulting in the classic inflammatory symptoms of a runny nose and congestion.


Why other options are incorrect:

  • Ampicillin: An antibiotic.


  • Nicotine: A stimulant found in tobacco.


  • Acetyl amine: Not a primary physiological inflammatory mediator.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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