Double signet ring and crescent gametocyte are characteristic of

Plasmodium ovale

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Plasmodium vivax

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Plasmodium falciparum

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Plasmodium malariae

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Solution

The correct option is D Plasmodium falciparum
The young trophozoite of Plasmodium falciparum is often called 'signet ring' due to its morphology of having double or multiple ring stages in Giemsa-stained blood smears. The gametocytes of P. falciparum are crescent or sausage shaped.
So, the correct answer is option C.

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