256857
Background Statute Under § 215 of the Social Security Act ( 42 USCS 415 ) , old-age insurance benefits are computed on the basis of the wage earner 's " average monthly wage " earned during his " benefit computation years , " which are the " elapsed years " ( reduced by five ) during which his covered wages were highest .
 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