Correct Answer - A
Fermentation is usually carried out by adding yeast to a mixture of sugars and water. Yeast contains enzymes that promote a long series of reactions that ultimately convert a simple sugar glucose `(C_(6)H_(12)O_(6))` to ethanol and carbon dioxide :
`C_(6)H_(12)O_(6) underset("from yeast")overset("Zymase")rarr underset(-95%yield)(2C_(2)H_(5)OH+2CO_(2))`
