Most commonly associated disorder with Down's syndrome among the following is
Among the following options, Early onset Alzheimer's disease is most appropriate.

AML & ALL have equal incidence
Duodenal atresia is most Common GI disorder associated with Down's syndrome.
Early onset Alzheimer's disease (Pre-senile Alzheimer's in associated with Down's syndrome.
Hirschsprung disease
CML
Late onset Alzheimer's disease
Early onset Alzheimer's disease