22674
Surprisingly , urea behaves as the better solvent in the mixture not because there exists a stronger affinity of the polymer for urea .
 Chemical: urea; Chemical: urea
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: urea; Chemical: urea