1850
Physicians should be aware of this potential interaction and use caution when prescribing levofloxacin to patients taking warfarin .
 Chemical: levofloxacin; 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: levofloxacin, warfarin 
Answer:
 Chemical: levofloxacin; Chemical: warfarin