Question: Indian film director AR Murugadoss won Best Director for his film "Kaththi", starring which actor in dual roles? 
Context: Khaidi No. 150 (English: "Prisoner No. 150" ) is an Indian Telugu-language action drama film directed by V. V. Vinayak, and written by AR Murugadoss.  The film features Chiranjeevi and Kajal Aggarwal in the lead roles and marks the former's comeback to acting after 10 years in his 150th film.  It is a remake of the Tamil film "Kaththi" (2014) starring Vijay and Samantha Ruth Prabhu, and marks the third entry in Chiranjeevi's successful "Khaidi" trilogy.  Principal photography of the film commenced in June 2016 in Hyderabad. Anand Shankar (Tamil: ஆனந்த் சங்கர் ) is an Indian film director and screenwriter, primarily working in Tamil cinema.  Shankar started his career as an assistant director to Siddharth Anand in "Anjaana Anjaani" (2010).  He also assisted producer-director AR Murugadoss in movies such as "Thuppakki" and "7aum Arivu".  He successfully finished his work as debut director on "Arima Nambi" starring Vikram Prabhu and Priya Anand, a Tamil thriller film.  Shankar is currently directing "Iru Mugan" starring Vikram, Nayanthara and Nithya Menen. R Ajay Gnanamuthu, is an Indian Film Director and Screenwriter working primarily in Tamil Cinema.  He started his career assisting Producer-Filmmaker AR Murugadoss in Tamil films 7aum Arivu and Thuppakki.  In 2015, He Debuted as a Director with his Horror-Thriller film Demonte Colony, which was received well by critics and the audience.  It was declared a SuperHit at the Box-office. Kaththi is the soundtrack album of the 2014 Indian Tamil action drama film of the same name written and directed by AR Murugadoss.  Anirudh Ravichander composed the soundtrack album and background score for the film.  The soundtrack album consists of five tracks and two theme music versions.  It was digitally released on iTunes on 17 September 2014.  The album was released officially on 18 September 2014 at the Leela Palace Hotel in Chennai. 7aum Arivu (pronunciation: "Ēḻām aṟivu") (English: "Seventh Sense") is a 2011 Indian science fiction-martial arts film written and directed by AR Murugadoss, featuring Suriya and Shruti Haasan in the lead roles and Johnny Tri Nguyen as the main antagonist.  The film, produced by Udhayanidhi Stalin began production in May 2010 and was released on 25 October 2011 in Chennai and a day later, on Diwali, worldwide.  The visual effects for the film were done by US based Legacy effects, making this their second Indian film after "Enthiran". Kaththi (English: "The Knife" ) is a 2014 Indian Tamil masala film written and directed by AR Murugadoss.  The film stars Vijay in dual roles while Samantha Ruth Prabhu, Neil Nitin Mukesh, Tota Roy Chowdhury and Sathish play supporting roles.  Anirudh Ravichander composed the film's soundtrack and score.  Cinematography was done by George C. Williams and the film was edited by A. Sreekar Prasad.  Lyca Productions and Ayngaran International bankrolled the venture and Eros International purchased the theatrical and audio rights for the film.  The story revolves around the tale of Kathiresan and Jeevanantham who are lookalikes and focuses on the issue of farmers committing suicide due to corporate encroachment.  The film, which commenced filming in January 2014 in Kolkata, was released on 22 October 2014 worldwide, coinciding with the festival of Deepavali.  Upon release, the film opened to mostly positive reviews from critics and was the highest grossing Tamil film of 2014. Arunasalam Murugadoss, commonly known with his stage name initials AR Murugadoss, is an Indian film director, producer, and screenwriter.  He's best known for his action Tamil films and Telugu films and for remaking them in Hindi cinema.  This includes the Suriya-starrer "Ghajini" (2005) and its Hindi remake "Ghajini" (2008) starring Aamir Khan, along with the Vijay-starrer "Thuppakki" (2012) and its Hindi remake " " (2014) starring Akshay Kumar.  His 2002 Tamil film "Ramanaa" was remade in Hindi by director Krish as "Gabbar Is Back" (2015) starring Akshay Kumar as well.  Murugadoss won the Filmfare Award for Best Director for his 2014 Tamil action-drama film "Kaththi". Maya is an Indian film actress who has appeared in the Tamil film industry.  After making her film debut with AR Murugadoss's production "Maan Karate" (2014) in a supporting role, she has since moved on to play leading roles. Raja Rani (English: "King, Queen" ) is a 2013 Indian Tamil-language romantic comedy-drama film directed by debutant Atlee, who previously worked with Shankar as an assistant in "Enthiran" (2010) and "Nanban" (2012).  Produced by AR Murugadoss and Fox Star Studios, the film features Arya, Jai, Nayantara and Nazriya Nazim in the lead roles while Sathyaraj, Santhanam and Sathyan appear in supporting roles.  The film released worldwide on 27 September 2013, to generally positive reviews from critics.  The Telugu dubbed version is also titled as "Raja Rani" and was released on March 14, 2014.  It was remade in Bengali as "Shudhu Tomari Jonyo" in 2015, with Dev, Srabanti Chatterjee, Soham Chakraborty and Mimi Chakraborty and in Odia as "Tu Je Sei" starring Babushan. "Kaththi" is a 2014 Indian Tamil-language masala film written and directed by AR Murugadoss.  The film featured Vijay and Samantha Ruth Prabhu in the lead roles.  Sathish, Neil Nitin Mukesh and Tota Roy Chowdhury played supporting roles.  The film's story focuses on Kathiresan (Vijay), a thief who is mistaken for Jeevanandham (Vijay), a graduate in Hydrology who leads a rebellion by farmers from his village, Thanoothu, against Chirag (Mukesh), the owner of a soft drink company.  Chirag wants to take over the lands in Thanoothu for his own profit.  Kathiresan, on seeing the plight of the people in the village, decides to help them in their cause.  Produced by Allirajah Subaskaran and K. Karunamoorthy under their production company Lyca Productions, the soundtrack and score were composed by Anirudh Ravichander.  George C. Williams and A. Sreekar Prasad were in charge of the cinematography and editing respectively.
Answer: Vijay