What is the relationship between Dixons Carphone and LONDON 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.

LONDON (ShareCast) - Decent gains from blue chips BP and Dixons Carphone (LSE: DC.L - news ) helped UK markets to rise on Thursday, bucking the negative trend seen across Europe as investors started to trim positions ahead of a pivotal weekend for Greece.

Answer: headquarters_location