What is Huntington's disease? a curable, fatal neurological (brain) disorder
an incurable, nonfatal neurological (brain) disorder
an incurable, fatal neurological (brain) disorder
a curable, nonfatal neurological (brain) disorder

Huntington disease is an incurable , fatal neurological (brain) disorder.

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necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.