What is the relationship between Eurogroup and Jeroen Dijsselbloem in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

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.

Answer: chairperson