Question

anaerobic fermentation results in pyruvic acid being reduced to acid.

Explanation:

In anaerobic fermentation, pyruvic acid is reduced to lactic acid in lactic - acid fermentation (a type of anaerobic fermentation in some organisms like muscle cells during strenuous exercise) or to ethanol and carbon dioxide in alcoholic fermentation (in yeast). But the most common answer for the general case of pyruvic acid reduction in anaerobic fermentation in animal cells is lactic acid.

Answer:

lactic