What is the relationship between Merkel and Germany 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.

An EU source reported that Merkel and Schaeuble, whose complex decade-long partnership in government is a source of fascination for Germany watchers, had "major differences" over the terms of the Greek rescue last week.

Answer: headquarters_location