Which of the following equations correctly represents the reaction of nicotinamide adenine dinucleotide that releases energy?

• A. NADH → NAD⁺ + 2e⁻ + H⁺ + Energy
• B. NAD⁺ + H⁺ → NADH + Energy
• C. NADH + 2e⁻ → NAD⁺ + Energy
• D. NAD⁺ + 2H⁺ → NADH + 2e⁻ + Energy

Answer: (A)