Which of the following is a correct, concise definition of carbohydrate at a biochemical level?

• A. Carbohydrates are organic molecules made of saccharide units, typically following the empirical formula (CH2O)n, serving roles in energy and structure.
• B. Carbohydrates are inorganic salts of carbon that do not contain hydrogen or oxygen and are primarily used to store genetic information.
• C. Carbohydrates are polymers of amino acids that constitute the primary structural material of membranes and are chemically identical to proteins.
• D. Carbohydrates are molecules solely composed of hydrogen and nitrogen used exclusively for neurotransmission and are not found in plants.

Answer: (A)