In patients suffering from sleeping sickness, the critical symptom which may lead to death appears when the parasite invades

Spleen

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Heart

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Cerebrospinal fluid

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Vitreous humor

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Solution

The correct option is C Cerebrospinal fluid
Sleeping sickness is curable if treatment is given quickly, however, if left untreated the disease is fatal. Once in the second stage of the disease, when the parasite has crossed the blood-brain barrier, treatment becomes much more aggressive with more toxic drugs needed to kill the parasite. So, the correct option is "C" (Cerebrospinal fluid).

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