After a meal of raw oysters, a woman begins to feel numbness and tingling in her hands and feet. By the time she gets to the hospital, she can no longer move and is having difficulty breathing. The lab finds a protist with two flagella. The organism is a(n):

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The symptoms described are consistent with paralytic shellfish poisoning (PSP), which can occur after the consumption of certain species of shellfish, including oysters, that have accumulated toxins produced by dinoflagellates. The fact that the organism has two flagella further supports the identification of a dinoflagellate.

After a Meal of Raw Oysters, a Woman Begins to Feel