23271
OBJECTIVETo assess glucose - lowering mechanisms of sitagliptin ( S ) , metformin ( M ) , and the two combined ( M + S ) . RESEARCH DESIGN AND METHODSWe randomized 16 patients with type 2 diabetes mellitus ( T2DM ) to four 6 - week treatments with placebo ( P ) , M , S , and M + S .
 Chemical: glucose; Chemical: sitagliptin; 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: glucose; Chemical: sitagliptin; Chemical: metformin