16581
AIM : The aim of the study is to compare the effects of metformin and insulin treatment for gestational diabetes mellitus ( GDM ) on vitamin B12 and homocysteine ( Hcy ) status .
 Chemical: metformin; Chemical: vitamin B12; Chemical: homocysteine; Chemical: Hcy
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; Chemical: vitamin B12; Chemical: homocysteine; Chemical: Hcy