18128
N - nitroso metabolites of RDX were also present in tested tissues in a dose - dependent pattern .
 Chemical: N - nitroso
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: N - nitroso 
Answer:
 Chemical: N - nitroso