7219
We found that sarin concentrates at the interface between the hydrophilic and hydrophobic subphases of hydrated Nafion acting as a surfactant .
 Chemical: sarin; Chemical: hydrated Nafion
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: sarin, hydrated Nafion 
Answer:
 Chemical: sarin; Chemical: hydrated Nafion