Question: The 2006 documentary film "Knocking" focuses on which teaching of Johovah's Witnesses that is based on freedom of thought?

Context paragraphs:
Small Town Gay Bar: Small Town Gay Bar is a 2006 documentary film directed by Malcolm Ingram that focuses on two gay bars in the rural deep Southeast United States, one in Shannon, Mississippi, and one in Meridian, Mississippi.  The documentary was produced by View Askew Productions with Kevin Smith serving as executive producer.

The World's Best Prom: The World's Best Prom is a 2006 documentary film about a high school prom in Racine, Wisconsin.  "Prom" was released as a short film and was expanded to feature-length documentary length.  It was released in its longer form on April 4, 2006.  It was filmed on location in Racine and was shot entirely in digital video.  This film was originally a 17-minute short film of the same name which won Best Documentary at the Wisconsin Film Festival.  The film was also re-edited as mini-episodes for Truth, but the episodes never aired.

Maquilapolis: Maquilapolis (from Spanish: "Maquiladora", referring to the manufacturing operations in a free trade zone, and Greek: πόλις, meaning city) is a 2006 documentary film by Vicky Funari and Sergio De La Torre.  It filmed in Tijuana, Baja California and focuses on the factories on the U.S.-Mexican border.  The film was made in collaboration with its subjects.  Funari and De La Torre established workshops for the woman to learn how to use video equipment to tell their own stories.

Knightsbridge International: Knightsbridge International is a US-based non-governmental organization based in West Hills, California that provides humanitarian assistance and disaster relief to regions around the world.  KBI was founded in 1995 by members of an American priory of the Knights of Malta.  Past missions include relief efforts in Afghanistan during Operation Enduring Freedom and after 2004 Boxing Day tsunami disaster.  The organization was the subject of a 2006 documentary film "Beyond the Call", and a 2008 book entitled "A Prescription For Peace."

Hip-Hop: Beyond Beats and Rhymes: Hip-Hop: Beyond Beats and Rhymes is a 2006 documentary film written, produced, and directed by Byron Hurt.  The documentary explores the issues of masculinity, violence, homophobia and sexism in hip hop music and culture, through interviews with artists, academics and fans.  Hurt's activism in gender issues and his love of hip-hop caused him to feel what he described as a sense of hypocrisy, and began working on the film.  The premiere of the film took place at the Sundance Film Festival, being welcomed by a standing ovation.  It has also won Best Documentary at the San Francisco Black Film Festival and the Audience Award at the Roxbury Film Festival.  On February 20, 2007 the film aired on the PBS Emmy-winning documentary series, "Independent Lens".

For the Love of Dolly: For the Love of Dolly is a 2006 documentary film directed by Tai Uhlmann.  It focuses on five colorful Dolly Parton fans and explores their fascination with the singer.  The film made its debut at the 2006 Miami Film Festival.

Knocking (film): Knocking is a 2006 documentary film directed by Joel Engardio and Tom Shepard that focuses on the civil liberties fought for by Jehovah's Witnesses.  It focuses primarily on the stories of three Jehovah's Witnesses, and how their lives demonstrate three fundamental Witness teachings that have affected society in general: Conscientious objection, and rejection of blood transfusions and saluting the flag.

The World According to Sesame Street: The World According to Sesame Street is a 2006 documentary film created by Participant Productions, looking at the cultural impact of the children's television series "Sesame Street", and the complexities of creating international adaptations.  It focuses on the adaptations of "Sesame Street" in Bangladesh ("Sisimpur"), Kosovo ("Rruga Sesam", in Albanian; and "Ulica Sezam", in Serbian), and South Africa ("Takalani Sesame").  The film premiered at the 2006 Sundance Film Festival in the documentary competition.

Putting the River in Reverse: Putting the River in Reverse is a 2006 documentary film about the first major recording session in New Orleans, United States, following Hurricane Katrina.  It features Elvis Costello and Allen Toussaint.  It was directed by Matthew Buzzell and premiered at the 2006 Full Frame Documentary Film Festival.  It also played at the 2006 Tribeca Film Festival.

Conscientious objector: A conscientious objector is an "individual who has claimed the right to refuse to perform military service" on the grounds of freedom of thought, conscience, or religion.

Supporting paragraphs: Knocking (film) Conscientious objector
Answer: Conscientious objection