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M-Bus ( Meter-Bus ) is a European standard ( EN 13757-2 physical and link layer , EN 13757-3 application layer ) for the remote reading of gas or electricity meter s. M-Bus is also usable for other types of consumption meters .
 organization: European standard
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: European standard 
Answer:
 organization: European standard