Utilize the input text as a context reference, choose the right relationship between 'Lyft' and 'SAN FRANCISCO' from the options.
Options: headquarters location, subsidiary, owned by, distribution format

SAN FRANCISCO (Reuters) - The Massachusetts attorney general's office is examining how Uber and Lyft ensure equal access for people with disabilities, a spokeswoman for the attorney general told Reuters, adding to numerous other business issues facing the two companies.
headquarters location