Read the paragraph below to answer question.

Research advances in the ageing field can sometimes give a boost to charlatans pitching their elixirs. A case in point is resveratrol, found in grape skins and red wine: it seemed both to extend lifespan in some animals and to have health benefits in mice. The news media immediately leapt on the story, as did the pharmaceutical industry. David Sinclair, a molecular biologist at Harvard Medical School, has appeared on US national television discussing resveratrol's effects. But he now finds that quotes and images from his many media appearances are being taken out of context and used to pitch commercial resveratrol supplements of dubious value. In the studies conducted thus far, the dose of resveratrol used has been much larger than any amount someone can obtain through diet alone and most resveratrol supplements contain a much smaller dose than those used in research.

Adapted from Nature, 2010, &Today’s Dietitian, 2012.

Based on the text, consider the assertions below.

I. Legitimate scientific researches occasionally encourage scams.

II. A grape compound called resveratrol has been proven to be effective against ageing.

III. The news media has been misquoting a Harvard biologist’s words to sell their supplements.

IV. One cannot get the recommended dose of resveratrol through diet or supplements.

The correct assertion(s) is/are