19053
While PFOS decreased DHEA levels , PFOA produced an increase at day 49 , and while PFOS decreased estrone , PFOA produced a slight increase at day 56 .
 Chemical: PFOS; Chemical: DHEA; Chemical: PFOA; Chemical: PFOS; Chemical: estrone; Chemical: PFOA
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: PFOS; Chemical: DHEA; Chemical: PFOA; Chemical: PFOS; Chemical: estrone; Chemical: PFOA