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In which one of the following options the two examples are correctly matched with their particular type of immunity?

1. Polymorphonuclear leukocytes and monocytes - Cellular barriers
2. Anti-tetanus and anti-snake bite injection - Active immunity
3. Saliva in mouth and tear in eyes - Physical barriers
4. Mucus coating of epithelium lining the urogenital tract and the HCl in stomach - Physiological barriers

Correct answer: Mucus coating of epithelium lining the urogenital tract and the HCl in stomach - Physiological barriers

Solution

Mucus coating and stomach HCl are both physiological barriers because they create conditions that inhibit or destroy pathogens. The other options mismatch the examples with the wrong immunity category.

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