2010
Wild - type ( WT ) and ILK : liver - / - mice were given PB ( 0 . 1 % in drinking water ) for 10 days .
 Chemical: PB
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: PB