Pyruvic acid is the key product of glycolysis, which can have many metabolic fates. Under the aerobic condition, it forms Acetyl CoA + CO₂ which is further converted to CO₂ + H₂O after citric acid cycle. The other options are incorrect as they are the products for anaerobic fermentation, i.e., Lactic acid, Ethanol + CO₂ and oxidized product of Acetyl CoA in the citric acid cycle, i.e., CO₂ + H₂O.