During the Krebs cycle, complete aerobic oxidation of glucose (C₆H₁₂O₆) produces each of the following, except one. Which is the exception? a) Carbon dioxide (CO₂) b) ATP (Adenosine Triphosphate) c) NADH (Nicotinamide Adenine Dinucleotide) d) Glucose (C₆H₁₂O₆)