Which of the following is the most frequent source of symptomatic lead poisoning in children?
A. Folk remedies
B. Lead-based paint
C. Unglazed pottery
D. Cigarette butts and ashes
Answer: B. Lead-based paint in houses built before 1978 is the most frequent source of lead poisoning. Some folk remedies and unglazed pottery may contain lead, but they are not the most frequent source. Cigarette butts and ashes do not contain lead.
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