The ciliate living in the rectum of toads and frogs is

Pelomyxa

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Opalina

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Balantidium

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Trichomonas

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Solution

The correct option is C Opalina
The Opalina is a small group of protists, assigned to the family Opalinidae. Their name is derived from the opalescent appearance of these microscopic organisms when illuminated with full sunlight. Most Opalina live as endocommensals (dwelling within the body of its host) in the large intestine and cloaca of frogs and toads. Thus, the correct answer is option B.

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