Question: Which was a documentary film distributed by HBO, Thin or Congo River, Beyond Darkness?

Context paragraphs:
Grenzeloze Liefde – Made in Japan: Love beyond frontiers – Made in Japan (original title: 'Grenzeloze liefde - Made in Japan') is a 1996 Dutch documentary film by the director Puck de Leeuw.  The documentary tells the story of two Dutch women and one Flemish woman, living in Japan with their Japanese husbands and coping with their new way of life.  The documentary is part 1 of the series 'Love beyond frontiers'.  The other documentary film in this series is part 2, 'Love beyond frontiers; made in Africa'.  Part 3, 'Love beyond frontiers; made in USA' was never made.

Congo River, Beyond Darkness: Congo River, beyond darkness is a 2005 film by Thierry Michel examining the Congo River in Africa.

New Haven Documentary Film Festival: New Haven Documentary Film Festival (also known as NHdocs) is an annual documentary film festival held in New Haven, Connecticut, over a weekend in the month of June.  Screenings take place at Yale University’s Whitney Humanities Center Auditorium and the New Haven Free Public Library.  NHdocs is a regional festival that showcases documentaries by filmmakers from the greater New Haven area and beyond.  NHdocs was launched in 2014 when the film festival’s co-founders Charles Musser, Gorman Bechard, Jacob Bricca, and Lisa Molomot came together at the Big Sky Documentary Film Festival and decided to create a documentary film festival in New Haven that would “build a sense of community among documentary filmmakers from the greater New Haven area.”  In 2014, the four filmmakers each showed one of their recently completed documentaries, three of which had just played at the Big Sky.

Heart of Darkness: Heart of Darkness (1899) is a novella by Polish-British novelist Joseph Conrad, about a voyage up the Congo River into the Congo Free State, in the heart of Africa, by the story's narrator Charles Marlow.  Marlow tells his story to friends aboard a boat anchored on the River Thames, London, England.  This setting provides the frame for Marlow's story of his obsession with the ivory trader Kurtz, which enables Conrad to create a parallel between London and Africa as places of darkness.

My Heart of Darkness: My Heart of Darkness is a Swedish–German 2010 documentary film about four ex-soldiers from different sides of the Angolan civil war and their posttraumatic stress disorder.  The film was recorded in 2007.  It was first shown at the International Documentary Film Festival Amsterdam on November 20, 2010.  It premiered in Sweden on April 8 the next year.  The title of the film is a reference to Joseph Conrad's novella "Heart of Darkness".  The film, like the novella, takes place on a boat traveling up an African river, and covers issues of tragedy and abuse.

Beyond Darkness: Beyond Darkness (Italian: La Casa 5, also known as Horror House II) is a 1990 Italian horror film directed by Claudio Fragasso.  It was written by Fragasso and screenwriter and wife Rossella Drudi and produced by Joe D'Amato.  The La Casa films (III, IV and V) in Italy were all marketed as sequels of a sort to the American films "The Evil Dead" and "Evil Dead II", which were released in Italy as "La Casa" and "La Casa 2" respectively.

In Darkness and in Light: In Darkness and in Light is a 2011 short film distributed by Warner Bros., scripted by Ian Michael Kintzle, from a story by Kintzle and John O'Callaghan, and directed by James Sullos and Mike Jones.  The film is packaged with a boxset of music from the American rock band The Maine, and is sold exclusively on iTunes.

Thin (film): Thin (often styled as THIN) is a 2006 cinéma vérité documentary film directed by Lauren Greenfield and distributed by HBO.  It was filmed at The Renfrew Center of Florida in Coconut Creek, a 40-bed residential facility for the treatment of women with eating disorders.  The film follows four women with anorexia nervosa, bulimia nervosa and other eating disorders in their struggle for recovery.  It premiered to the general public November 14, 2006 on HBO.

Bushongo mythology: The Bushongo are an ethnic group from the Congo River and surrounding areas.  The creation god(or chembe) in Bushongo mythology is called Bumba.  He existed alone in darkness, the world consisting only of water.  The god Bumba was said to appear like a gigantic man in form and white in color.  The creation took place when he vomited forth the sun, moon, earth, plants and animals, and then humanity.  Bomazi is the ancestor-god of the Bushongo.

Congo (BBC TV series): Congo is a 2001 BBC nature documentary series for television on the natural history of the Congo River of Central Africa.  In three episodes, the series explores the variety of animals and habitats that are to be found along the river’s 4,700 km (2,922 mi) reach.

Supporting paragraphs: Thin (film) Congo River, Beyond Darkness
Answer: Thin