Refer to the input text as context and select the correct relationship between 'Halliburton' and 'HOUSTON' from the available options.
Options: headquarters location, stock exchange, creator, distributed by

HOUSTON Aug 7 (Reuters) - Business is so tough for oilfield giants Schlumberger NV and Halliburton Co that they have come up with a new sales pitch for crude producers halting work in the worst downturn in years.
headquarters location