In some individuals, vegetables such as appear to "turn off" genes that promote the oxidative stress and inflammation that can damage dna.

Answer is Cabbage.

Explanation:

It should be noted that the turning on and off of the genes is known as the gene regulation. And this process is considered to be very important because it helps the cell to react quickly or promptly to the changes in the environment.

Oxidative stress usually occurs when there is imbalance the free radicals production  and the ability of the body to fight against their damaging effects or possibly repair their damaging effects. While inflammation is considered to be the reddening or swollen occurring in some parts of the body.

In this aspect, cabbage , as an example of vegetable help to turn-off the genes, i.e prevent the genes that can cause the oxidative stress or inflammation from performing their damaging activities.