Red tide is mostly caused by

Noctiluca

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Gymnodinium

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Symbiodinium

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Nematodinium

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Solution

The correct option is C Gymnodinium
Gymnodinium breve (later named as Karenia brevis) is a unicellular photosynthetic dinoflagellate mostly found in marine waters.
It is responsible for causing red tides when they are multiplied to higher than normal concentration.
Noctiluca results in green tides. Symbiodinium is related to coral reefs. Nematodinium is light sensitive.
The correct answer is B.

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