Refer to the input text as context and select the correct relationship between 'Eurogroup' and 'Jeroen Dijsselbloem' from the available options.
Options: distribution format, chairperson, founded by, location of formation

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.
chairperson