5794
We examined an initial step in this process , the uptake of NO ( 2 ) by water through the use of molecular dynamics simulations .
 Chemical: NO ( 2 )
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: NO ( 2 ) 
Answer:
 Chemical: NO ( 2 )