Refer to the input text as context and select the correct relationship between 'Trulia' and 'Zillow' from the available options.
Options: business division, parent organization, owner of, 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