15299
Polystyrene - b - dextran ( PS - b - Dextran ) copolymers can be used to prepare dextran brushes at solid surfaces , applying Langmuir - Blodgett deposition .
 Chemical: Polystyrene
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: Polystyrene 
Answer:
 Chemical: Polystyrene