2392
Follow - up MRIs were performed on 5 patients from third to 14th days after discontinuation of metronidazole administration .
 Chemical: metronidazole
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: metronidazole 
Answer:
 Chemical: metronidazole