21038
The hydration structure of NaCl aqueous solution was elucidated in carbon nanotubes ( CNTs ) on the basis of canonical ensemble Monte Carlo simulations .
 Chemical: NaCl; Chemical: carbon
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: NaCl, carbon 
Answer:
 Chemical: NaCl; Chemical: carbon