20001
In addition , differential scanning calorimetry ( DSC ) data showed that the thermosensitivity of PNB nanogels was retained .
 Chemical: PNB
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: PNB 
Answer:
 Chemical: PNB