This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
The end product of one stage fermentation is 
Select and explain. 
A. Formic acid, B. Pyruvate, C. Lactate, D. Ethanol
C: Lactate
Answer: C: Lactate 
Explanation: All other guides have given ethanol as the answer to this question. Which is incorrect.
One stage fermentation here means fermentation of pyruvate in one stage.
When pyruvate is formed, it can have several fates.
Under aerobic conditions, pyruvate enters the TCA cycle after conversion into acetyl CoA by PDH.
There are two fates for pyruvate under anaerobic metabolism:-