Question

A person has to be exposed to a particular ........................ to become allergic to it.

• A. protein
• B. antigen
• C. allergen
• D. symptom

Hint:

Distinguish between general and specific terms in science. While many allergens are proteins, the correct categorical term for any substance causing an allergy is 'allergen'.

Answer 1

The Correct Option is C

Step 1: This question is from the chapter "Allergy" and asks about the cause of allergic sensitization.
Step 2: The development of an allergy occurs when the body's immune system is first exposed to a substance and mistakenly identifies it as a threat.
Step 3: This specific substance is called an 'allergen'. Upon first exposure (sensitization), the body produces antibodies. Subsequent exposures to the same allergen trigger the allergic reaction. While many allergens are proteins (A), 'allergen' is the correct and more general scientific term for any such substance.