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As a parent, you don't know what you're picking up out of the produce bin, is it elevated because of the cultivar -- the particular type of sweet potato or carrot ? Or is it elevated because it's grown in an area where the soil has naturally high levels of lead ? Answering these questions will be the responsibility of government regulators and industry, Houlihan said. The FDA has a Closer to Zero campaign, for example, which could take on the issue.CNN has reached out to The FDA for comment but hasn't yet received a response.