1818
` ` The annual cost - of - living adjustment is one of the most critically important features of the Social Security program , ' ' said Social Security Commissioner Kenneth Apfel .
 Social Security, Social Security Commissioner, Social Security Commissioner Kenneth Apfel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 Social Security, Social Security Commissioner, Social Security Commissioner Kenneth Apfel