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The Croatia national under-21 football team also known as Croatia under-21 ( s ) or Croatia U21 ( s ) is a youth association football national team which represents  Croatia  at this age level and is a feeder team for the  Croatia national football team  .
 country of headquarters: Croatia, Croatia national football team
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: cities of residence, top members employees, members, alternate names, origin, state or provinces of residence, title of person, spouse, city of headquarters, NA, founded by, state or province of headquarters, employee of, countries of residence, country of birth, founded, subsidiaries, country of headquarters 
Text: {0} 
 Entity Pairs:  Croatia, Croatia national football team 
Answer:
 country of headquarters: Croatia, Croatia national football team