13628
Red deer and wild boar from the mining area studied had higher spleen , liver , and bone Pb levels than controls , indicating a chronic exposure to Pb pollution .
 Chemical: Pb; 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; Chemical: Pb