Both organic and functional mental disorders can be caused by: Chemical imbalances. Thus, option "C" is correct.
As currently utilised, 'organic' tic disruption refers to the diagnosis set through the traditional diagnostic standards that exclude neurological deterioration, but also refers to tic disorder after acquired brain injury, while 'functional' directs to tic disorder without neurological damage but with atypical presentation.
Thus, option "C" is correct.
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