What is the relationship between Kosmos Energy and DALLAS 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.

CHICAGO -- ADM Donates $325,000 to Promote Clean Waterways Source: Archer Daniels Midland Company TORRANCE, Calif. -- Phenomenex Raises $19,450 for American Red Cross in Soccer Charity Cup Source: Phenomenex, Inc. DALLAS -- Perot Museum of Nature and Science Announces Innovative Kosmos Energy STEM Teacher Institute to Empower Teachers in Science Instruction Source: Kosmos Energy CHICAGO -- Hyatt to Partner with Khan Academy to Bring Open-Source Global Learning to Colleagues and Communities Source: Hyatt

Answer: headquarters_location