1353
In 2 of the 4 patients , rechallenge with warfarin led to recurrence of the lesions .
 Chemical: warfarin
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: warfarin 
Answer:
 Chemical: warfarin