26710
Objectives : The role of metformin in the treatment of pregnant women with polycystic ovary syndrome is controversial .
 Chemical: metformin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: metformin 
Answer:
 Chemical: metformin