24359
Human thyroid tissues of about 1 mm ( 3 ) were cultured in vitro and cell viability was determined up to 3 weeks by the MTT assay .
 Chemical: MTT
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: MTT 
Answer:
 Chemical: MTT