Question: Who was the director of the 2006 film for which Shajith Koyeri won a National Film Award award for sound design?
Context: Ashim Ahluwalia (born 1972 in Mumbai, India) is a film director and screenwriter.  He made his directorial debut with the feature-length documentary "John & Jane" (2005), which had a world premiere at the Toronto International Film Festival and a European premiere at the Berlin International Film Festival, and won him the 2005 National Film Award for Best First Non-Feature Film of a Director.  This was followed by his first narrative feature film "Miss Lovely", premiered at the 2012 Cannes Film Festival.  which won him India's National Film Award – Special Jury Award (Feature film), and Best Production Design at the 61st National Film Awards. The National Film Award for Best Actor, officially known as the Rajat Kamal Award for the Best Actor (] ), is an honour presented annually at the National Film Awards of India instituted only since 1967 to actors who have delivered the best performance in a leading role within the Indian film industry.  Called the "State Awards for Films" when established in 1954, the National Film Awards ceremony is older than the Directorate of Film Festivals.  The State Awards instituted the individual award in 1968 as the "Bharat Award for the Best Actor"; in 1975, it was renamed as the "Rajat Kamal Award for the Best Actor".  Throughout the past 45 years, accounting for ties and repeat winners, the Government of India has presented a total of 52 "Best Actor" awards to 40 actors.  Until 1974, winners of the National Film Award received a figurine and certificate; since 1975, they have been awarded with a "Rajat Kamal" (silver lotus), certificate and a cash prize. Woh Chokri (1994) (English: That Girl ; Hindi: वो छोकरी ) is an Indian movie directed by Subhankar Ghosh and stars Pallavi Joshi, Neena Gupta, Paresh Rawal and Om Puri.  Film won 3 National Film Awards.  Pallavi Joshi won National Film Award – Special Jury Award whereas Paresh Rawal won the National Film Award for Best Supporting Actor and Neena Gupta that of the National Film Award for Best Supporting Actress for this movie. The National Film Award for Best Lyrics (the Silver Lotus Award) is an honour presented annually at the National Film Awards by the Directorate of Film Festivals (DFF) to a lyricist who has composed the best song for films produced within the Indian film industry.  The award was first introduced at the 16th National Film Awards in 1969.  It was intermittently awarded till the 22nd National Film Awards (1975).  From then on, no award was presented until the 32nd National Film Awards (1985).  However, since 1985 every year the award has been presented with the exception of the 34th National Film Awards (1987).  As of the 62nd National Film Awards (2015), the DFF has presented a total of 36 awards to 24 different lyricists. Omkara is a 2006 Indian crime drama film adapted from Shakespeare’s "Othello", co-written and directed by Vishal Bhardwaj.  It starred Ajay Devgan, Saif Ali Khan, Vivek Oberoi and Kareena Kapoor in the lead roles, supported by Naseeruddin Shah, Konkona Sen Sharma and Bipasha Basu.  The director Vishal Bhardwaj himself composed the entire music for the film, including the background score, with lyrics by Gulzar.  The film is set in Meerut, a town in Western Uttar Pradesh. Shajith Koyeri is a sound designer in the field of sync sound technique and an experienced creative sound designer in Indian cinema.  A National Film Awards winning sound designer for Omkara, Shajith also won two Filmfare awards and two IIFA Awards.  He is the recipient of the Star Screen Award for Kaminey.  He has a specialized expertise in the area of “Post-production of sync sound”.  Shajith is also known for his work in Foley editing and pre-mixing. The first Tony Award for "Best Sound Design of a Play" and "Best Sound Design of a Musical" was given in the 2007-2008 season.  In 2014, the Tony Awards Administration Committee announced that starting with the 2014-2015 season the Tony Award for Best Sound Design in a Play/Musical would be eliminated.  The Tony Administration Committee may bestow a Special Tony Award to a production when it determines that extraordinary sound design has been achieved. The Hong Kong Film Award for Best Sound Design is an award presented annually at the Hong Kong Film Awards for a film with the best sound design.  As of 2016 the current winners are Kinson Tsang, George Yiu-Keung Lee and Chun Hin Yiu for "The Taking of Tiger Mountain". Kanwarjit Singh Sawhney, a.k.a. K. J. Singh is an Indian audio engineer based in Mumbai who won the 54th National Film Award for Best Audiography and Filmfare Award for Best Sound Design with Shajith Koyeri and Subash Sahu for his work on the 2006 film "Omkara". V. K. Prakash is an Indian director who has worked on films, music videos, and commercials.  He has worked on Malayalam, Telugu, Marathi, Kannada and Hindi films, although he is mainly active in Malayalam cinema.  Born in a Malayali family in Mumbai, and currently based in Bangalore, he runs his own ad film production company called "Trends Adfilm Makers Pvt Ltd".  He studied in the School of Drama, Thrissur before commencing his career in the ad film industry.  V. K. Prakash's first film "Punaradhivasam" received the awards for National Film Award for Best Feature Film in Malayalam, Kerala State Film Award for Best Debut Director and Kerala State Film Award for Best Story. .  The second National Film Award was awarded for Nirnayakam as The Best Film on Social Issues in 2016.
Answer: Vishal Bhardwaj