Question

question: which is a progressive and rare brain disease as well as a debilitating genetic disorder? answer options: select one of four huntingtons disease mosaicism sickle cell disease cystic fibrosis

Explanation:

Huntington's disease is a progressive, rare brain disease and a debilitating genetic disorder caused by a mutation in a single gene, affecting the nervous system. Mosaicism is a genetic phenomenon (not a disease in this context), sickle cell disease affects red blood cells, and cystic fibrosis affects the lungs and digestive system.

Answer:

A. Huntington's disease