Eurogroup president Jeroen Dijsselbloem - who represents all 19 finance ministers - questioned whether Mr Tsipras could implement measures which he had attacked as "blackmail" and “humiliation” only seven days ago.
Analyze the relationship between 'Eurogroup' and 'Jeroen Dijsselbloem' within the context of the input sentence.
Options: chairperson, founded by, distribution format, location of formation