12870
Both low - level lead ( Pb ) exposure and prenatal stress ( PS ) have been associated with mesocorticolimbic system - mediated executive - function cognitive and attention deficits .
 Chemical: Pb
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Pb