11466
A Serum - Tolerant Hydroxyl - Modified Polyethylenimine as Versatile Carriers of pDNA / siRNA .
 Chemical: Hydroxyl; Chemical: Polyethylenimine
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: Hydroxyl, Polyethylenimine 
Answer:
 Chemical: Hydroxyl; Chemical: Polyethylenimine