1731
BACKGROUND : Our aim was to investigate postoperative complications and mortality after administration of aprotinin compared to tranexamic acid in an unselected , consecutive cohort .
 Chemical: tranexamic acid
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: tranexamic acid