2886
While serum concentrations of unconjugated BPA in controls were below the minimum level of detection , those from dams on the BPA diet were comparable ( 5 . 48 +/- 2 . 07 ng / ml ) to concentrations that have been observed in humans .
 Chemical: BPA; Chemical: BPA
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: BPA; Chemical: BPA