16580
Vitamin B12 and homocysteine status during pregnancy in the metformin in gestational diabetes trial : responses to maternal metformin compared with insulin treatment ( + )
 Chemical: Vitamin B12; Chemical: homocysteine; Chemical: metformin; 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: Vitamin B12; Chemical: homocysteine; Chemical: metformin; Chemical: metformin