10203
The parallel and antiparallel stacked dimers are nearly equal in energy , both only slightly less stable than the NH . . . O H - bonded structure .
 Chemical: NH; Chemical: O H
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: NH, O H 
Answer:
 Chemical: NH; Chemical: O H