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Infection of Ascaris usually occurs by:

1. Eating imperfectly cooked pork.
2. Tse-tse fly.
3. Mosquito bite.
4. Drinking water containing eggs of Ascaris.

Correct answer: Drinking water containing eggs of Ascaris.

Solution

Ascaris lumbricoides infects humans when embryonated eggs are swallowed, typically via contaminated water, food, or hands. The other options describe transmission routes for different diseases or parasites.

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