A compound isolated from food shows a carbon backbone and multiple functional groups. Based on this chemical evidence alone, which classification is most appropriate?

• A. Trace mineral, because any compound isolated in microgram quantities is classified as trace regardless of chemical composition which would require macromolecular analysis to refute.
• B. Major mineral, because carbon-containing substances are typically required in amounts over 100 mg per day.
• C. Mineral, because all dietary micronutrients are classified as minerals until tested in the body for function and storage.
• D. Vitamin, because the presence of carbon indicates an organic compound.

Answer: (D)