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The pooled ORs ( 95 % CIs ) of outcome for pregnant women with polycystic ovary syndrome prescribed metformin were 0 . 32 ( 0 . 19 - 0 . 55 ) for early pregnancy loss , 0 . 37 ( 0 . 25 - 0 . 56 ) for gestational diabetes , 0 . 53 ( 0 . 30 - 0 . 95 ) for preeclampsia and 0 . 30 ( 0 . 13 - 0 . 68 ) for preterm delivery .
 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: metformin