2004
OBJECTIVES : To correlate optical density and percent inhibition of a two - step heparin - induced thrombocytopenia ( HIT ) antigen assay with thrombosis ; the assay utilizes reaction inhibition characteristics of a high heparin concentration .
 Chemical: heparin; Disease: thrombocytopenia; Disease: HIT; Disease: thrombosis; Chemical: heparin
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: heparin, thrombocytopenia, HIT, thrombosis, heparin 
Answer:
 Chemical: heparin; Disease: thrombocytopenia; Disease: HIT; Disease: thrombosis; Chemical: heparin