Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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.

Historical comparisons were also made at the summit in Brussels that agreed the deal, with Merkel asked whether the tough conditions were not similar to the 1919 Versailles treaty that forced crushing reparations on Germany after World War One, with disastrous consequences.

Answer: headquarters_location: Merkel, Germany