The end product of glycolysis is

The chemical equation for the process of glycolysis is:

Glycolysis:
$I$. Causes partial oxidation of glucose (one molecule) to form $2$ molecules of pyruvic acid and $2$ $ATP$ as net gain.
$II$. Takes place in all living cells.
$III$. Uses $2$ $ATP$ at two steps.
$IV$. Scheme was given by Gustav Embden,Otto Meyerhof,and $J$. Parnas.
Choose the correct option containing appropriate statements from the above.

Which stage is common to lactic acid fermentation,alcoholic fermentation,and aerobic respiration?

Refer to the figure and answer the question. Choose the correct names of $P$, $Q$, $R$, and $S$.

Identify $A$ and $B$ respectively from the given glycolysis pathway.