Question: Batman: Gotham Knights was a monthly American comic book series published by DC Comics, DC Comics, Inc. is an American comic book publisher, it is the publishing unit of DC Entertainment, a subsidiary of which organization?
Context: DC Comics, Inc. is an American comic book publisher.  It is the publishing unit of DC Entertainment, a subsidiary of Warner Bros.  Entertainment, Inc., a division of Time Warner.  DC Comics is one of the largest and oldest American comic book companies, and produces material featuring numerous well-known heroic characters including Superman, Batman, Wonder Woman, Green Lantern, the Flash, Aquaman, Hawkman, and Green Arrow.  Most of their material takes place in the fictional DC Universe, which also features teams such as the Justice League, the Justice Society of America, the Suicide Squad, and the Teen Titans, and well-known villains such as the Joker, Lex Luthor, The Cheetah, Harley Quinn, Darkseid, Catwoman, Ra's al Ghul, Deathstroke, Reverse-Flash, Sinestro, Black Adam, and Brainiac.  The company has also published non-DC Universe-related material, including "Watchmen", "V for Vendetta", and many titles under their alternative imprint Vertigo. World's Finest Comics was an American comic book series published by DC Comics from 1941 to 1986.  The series was initially titled "World's Best Comics" for its first issue; issue #2 (Summer 1941) switched to the more familiar name.  Michael E. Uslan has speculated that this was because DC received a cease and desist letter from Better Publications, Inc., who had been publishing a comic book entitled "Best Comics" since November 1939.  Virtually every issue featured DC's two leading superheroes, Superman and Batman, with the earliest issues also featuring Batman's sidekick, Robin. Batman: Gotham Knights was a monthly American comic book series published by DC Comics.  The original intent of this book was to feature the exploits of Batman and his extended family, such as Alfred Pennyworth, Batgirl, Nightwing, Robin, Oracle, and Catwoman, among others.  The latter section of the run, however, came to focus much more upon his enemies. Batman Family was an American comic book series published by DC Comics comic book which ran from 1975 to 1978, primarily featuring stories starring supporting characters to the superhero Batman.  An eight-issue miniseries called "Batman: Family" was published from December 2002 to February 2003. Adventure Comics is an American comic book series published by DC Comics from 1938 to 1983 and revived from 2009 to 2011.  In its first era, the series ran for 503 issues (472 of those after the title changed from "New Adventure Comics"), making it the fifth-longest-running DC series, behind "Detective Comics", "Action Comics", "Superman", and "Batman".  It was revived in 2009 by writer Geoff Johns with the Conner Kent incarnation of Superboy headlining the title's main feature, and the Legion of Super-Heroes in the back-up story.  It returned to its original numbering with #516 (September 2010).  The series finally ended with #529 (October 2011), prior to DC's The New 52 company reboot as a result of the Flashpoint storyline. Superman: The Man of Steel is a monthly American comic book series that ran 136 issues from 1991 to 2003, featuring Superman and published by DC Comics.  As a result of introducing this series alongside its already existing titles, DC Comics was able to publish a new Superman comic each week.  Included in these 136 issues were two special issues: #0 (October 1994, published between issues #37 and #38) and #1,000,000 (November 1998, published between issues #83 and #84), which were tie-ins to "" and "DC One Million". Georges Jeanty is an American comic book penciler best known for his work on "The American Way", an eight-issue American comic book limited series produced under DC Comics' Wildstorm imprint, and the "Buffy the Vampire Slayer: Season Eight" comic book series published by Dark Horse Comics. Trinity is an weekly American comic book series published by DC Comics, featuring the superheroes Superman, Batman, and Wonder Woman.  The first volume of the series was published from June 2008 to May 2009.  In 2016, a second monthly comic book series was launched by DC Comics as the second volume of the series. Batman Incorporated (also known as Batman, Inc.) is an American comic book series published by DC Comics, featuring the superhero Batman.  Written by Grant Morrison, the series debuts following the events of "Batman R.I.P", "Final Crisis", "Batman and Robin", and "" where, after being stranded in the distant past and believed dead, Bruce Wayne has returned to the present day DC Universe.  Now, he is prepared to take his war on crime to the next level, by essentially "franchising" it and drafting, training and commanding a global team of heroes who will answer to Batman himself called Batman Incorporated. DC Rebirth is a 2016 relaunch by American comic book publisher DC Comics of its entire line of ongoing monthly superhero comic book titles.  Using the end of The New 52 initiative in May 2016 as its launching point, DC Rebirth restored the DC Universe to a form much like that prior to the "Flashpoint" storyline while still incorporating numerous elements of The New 52, including its continuity.  It also saw many of its titles move to a twice-monthly release schedule, along with being released at .
Answer: Warner Bros.