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For example , the most accurately known quark mass is of the top quark ( ) at 172.7 " GeV / c or 172 " 700 " MeV / c , estimated using the On-shell scheme .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None