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Free fatty acid binding protein - 4 and retinol binding protein - 4 in polycystic ovary syndrome : response to simvastatin and metformin therapies .
 Chemical: fatty acid; Chemical: retinol; Chemical: simvastatin; Chemical: metformin
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: fatty acid; Chemical: retinol; Chemical: simvastatin; Chemical: metformin