Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
The relative rate of this compound's carboxylation is varied by the YPC model parameter. In a pathway that regenerates NAD+ from NADH, this triose ketoacid is converted via acetaldehyde into carbon dioxide and ethanol in an anaerobic environment. It is also anaerobically converted into lactate during muscle contraction, and serves as an important biochemical intermediate by bonding with acetyl coenzyme A to enter the Krebs cycle. FTP, identify this molecule produced by glycolysis.
A:
Science