Utilize the input text as a context reference, choose the right relationship between 'Trulia' and 'Zillow' from the options.
Options: business division, owner of, parent organization, director/manager

With the closing of its acquisition of competitor Trulia in February 2015, Zillow Group ( NASDAQ:Z ) ( NASDAQ:ZG ) became the largest business of real estate and home-related brands on the Internet.
parent organization