10210
 Complicating things is the fact that at least four of the prospective Democratic candidates are full-fledged members of Congress : Senators Obama of Illinois , Hillary Rodham Clinton of New York , Joseph R. Biden Jr. of Delaware and John Kerry of Massachusetts . 
 John Kerry, Massachusetts
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: nationality, country capital, place of death, children, location contains, place of birth, place lived, administrative division of country, country of administrative divisions, company, neighborhood of, company founders 
Text: {0} 
Answer:
 John Kerry, Massachusetts