GMAT Critical Reasoning (CR) | Diabetes is a disease in which the body does not produce or

HI

I have a query here

if we see its an cause and effect.

Glucose (cause)-------> (effect)Discomfort(Diabitic patient).

so for a right assumption there should be no alternate cause.

This is mentioned in D. if we negate statement D then it will shatter the conclusion.

Could you please clarify this. I stuck between D and E. and choose D

Thanks