Which of the following statements about lead exposure in young children is true?
a. The environment of inner-city, low-income children in the United States still contains lead.
b. Lead does not appear to harm the developing brain in a permanent way.
c. In one five-year longitudinal study, lead levels in young children were brought down using nutritional and mineral treatments, and cognitive deficits disappeared.
d. As long as there is no lead found in the home, children are safe from lead exposure.
Answer: A
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