Biology

Olive oil is not made by fermentation.

Olive oil is extracted from olives through mechanical processes, such as pressing or grinding, followed by separation. There is no fermentation involved in the production of olive oil.

The other options are correct:

Sauerkraut is made by the fermentation of cabbage. Lactic acid bacteria break down the sugars in cabbage, producing lactic acid, which preserves the cabbage and gives sauerkraut its sour taste.