Which of the following is the structure of d-galacturonic acid? 
Definitions:
Etiology
The study of the causes or origins of diseases or conditions; understanding the factors leading to a particular health outcome.
Disease
A condition that disrupts the normal function of the body or mind, often characterized by specific signs and symptoms.
Syndrome
A group of symptoms that consistently occur together or a condition characterized by a set of associated symptoms.
Signs
In medical or clinical contexts, signs are objective evidence of disease or physical changes in the body, observed by a healthcare professional.
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