1550
Ximelagatran , an oral direct thrombin inhibitor , was found to be as efficient as vitamin K antagonist drugs in the prevention of embolic events , but has been recently withdrawn because of abnormal liver function tests .
 Chemical: Ximelagatran; Chemical: vitamin K; Disease: embolic events; Disease: abnormal liver function
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: Ximelagatran, vitamin K, embolic events, abnormal liver function 
Answer:
 Chemical: Ximelagatran; Chemical: vitamin K; Disease: embolic events; Disease: abnormal liver function