10993
Dietary concentrations of 0 . 72 micro g Sigma PCBs / g feed ( 4 . 8 pg TEQWHO 2005 / g feed ) and greater induced mandibular and maxillary squamous epithelial proliferation in adult animals .
 Chemical: PCBs
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: PCBs