24875
The assay was able to discriminate between the two single - tobacco cigarettes ( P < 0 . 0001 ) , and between the single - tobacco cigarettes and the 2R4F ( P = 0 . 0008 , 2R4F vs . Burley and P < 0 . 0001 , 2R4F vs . Bright ) .
 None
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:  
Answer:
 None