What is the relationship between 'Sinopec' and 'Beijing' in the context of the input sentence.
Options: headquarters location, original broadcaster, business division, creator

SHANGHAI Aug 21 Safety hazards have been found at almost 70 percent of firms handling dangerous chemicals inspected in Beijing since two massive blasts killed 114 people last week, including a branch of Asia's largest refiner Sinopec Corp, state media reported.
headquarters location