What has served as the model for presymptomatic testing?
A) Alzheimer's disease
B) Huntington disease
C) Tay-Sachs disease
D) Sickle cell disease
Ans: B
Feedback: Huntington disease has served as the model for presymptomatic testing because the presence of the genetic mutation predicts disease onset and progression. The other answers are incorrect because they are not the model for presymptomatic testing.
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