9471
Specifically , we have studied terpolymers containing polystyrene ( PS ) , polybutadiene ( PB ) , and polyisoprene ( PI ) as the other blocks .
 Chemical: polystyrene; Chemical: polybutadiene; Chemical: polyisoprene
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, polybutadiene, polyisoprene 
Answer:
 Chemical: polystyrene; Chemical: polybutadiene; Chemical: polyisoprene