Dementia and Delirium are two somewhat broad biological phenomenon that are biological causes of mental illness. These interfere with biological processes with the brain. If we wish to be more specific, Cancers, Alzheimer and Parkinson's Disease can affect the brain by pressing on important aspects (Brain Cancer's) and/or cause progressive degeneration (Alzheimer and Parkinson's)
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Yessir or Yes mam, what so you like to get?
D. Smallpox is your answer
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He should have taken all standard precautions because they should be practiced in every case.
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