2399
On postnatal day ( PND ) 35 , male mice were exposed to 50mg BPA / kg diet per day for a period of 35 days .
 Chemical: BPA
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: BPA