The parasite which completes their life cycle in a single host is

Fasciola hepatica

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Plasmodium vivax

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Taenia sodium

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Ascaris lumbriciodis

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Solution

The correct option is D Ascaris lumbriciodis
Ascaris has a single-host life cycle i.e., monogenetic life cycle. People acquire infection by ingesting embryonated eggs with contaminated food and water. When these eggs reach into the intestine of the human host they develop, grow and live. Then, due to blood circulation, these undergo migration in the lungs of the host body. Therefore, the correct answer is option D.

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