Final answer:
Pyruvate is not an example of a reduced organic compound produced during fermentation.
Step-by-step explanation:
The correct answer is D. Pyruvate.
In fermentation, organic compounds are reduced, meaning they gain electrons and become more reduced. Examples of reduced organic compounds produced during fermentation include lactic acid, ethanol, and acetic acid. Pyruvate, however, is not an example of a reduced organic compound. It is an intermediate product of glycolysis and can be further metabolized into other compounds.