This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Most commonly associated disorder with Down's syndrome among the following is 
Select and explain. 
A. Hirschsprung disease, B. CML, C. Late onset Alzheimer's disease, D. Early onset Alzheimer's disease
D: Early onset Alzheimer's disease
Answer: D: Early onset Alzheimer's disease 
Explanation: 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.