A student has written an incorrect definition of “Allergen”. Which option should replace it?
- AAn exaggerated immune response to certain environmental antigens.
- BA disease produced by an immune response directed against the body's own components, such as rheumatoid arthritis.
- CA condition in which the immune system fails to distinguish self from non-self and attacks the body's own cells or tissues.
- DAn environmental antigen that triggers an allergic response in a susceptible person.
✓ Correct answer: D
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