Question: Sara Bennett is a visual effects artist that worked on what 2015 film directed by Alex Garland?

Context paragraphs:
Sunshine (2007 film): Sunshine is a 2007 British-American science fiction thriller film directed by Danny Boyle.  The film was adapted from a screenplay written by Alex Garland about the crew of a spacecraft on a dangerous mission to the Sun.  In 2057, with the Earth in peril from the dying Sun, the crew is sent on a mission to reignite the star with a nuclear bomb that has a mass equivalent to Manhattan Island.  The script was based on a scientific back-story that took the characters on a psychological journey.  The director cast a group of international actors for the film, and had the actors live together and learn about topics related to their roles, as a form of method acting.  To have the actors realistically react to visual effects that would be implemented in post-production, the filmmakers constructed live sets to serve as cues.  The ensemble cast features Cillian Murphy, Chris Evans, Rose Byrne, Michelle Yeoh, Cliff Curtis, Troy Garity, Hiroyuki Sanada, Benedict Wong, and Chipo Chung.

Mir Zafar Ali: Mir Zafar Ali (Urdu:میر ظفر علی) is a Pakistani movie visual effects artist.  He worked in the team that won the Academy Award for best visual effects for the 2007 movie "The Golden Compass".  He is the first Pakistani to have been connected with an Academy Award-winner for Best Visual Effects.

Anthony Scott Burns: Anthony Scott Burns (born May 9, 1977) is a Canadian filmmaker, visual effects artist and musician.  After starting his film career as a visual effects artist and director, as of 2015 he is directing three feature films in pre-production: "Dark Matter", "Holidays", and Plan B Entertainment's "Alpha".  He also releases music under the moniker Pilotpriest.

Sara Bennett: Sara Bennett is a British visual effects artist.  Best known for her works in "Harry Potter and the Chamber of Secrets" (2002), "Harry Potter and the Prisoner of Azkaban" (2004), "Harry Potter and the Goblet of Fire" (2005), "Doctor Who" (2005), "Merlin" (2008), "Jonathan Strange & Mr Norrell" (2009), "Skellig" (2009), "The Martian" (2015) and "Ex Machina" (2015).

Christopher Townsend: Christopher Townsend is a visual effects supervisor.  He has worked in the visual effects industry for over 20 years.  For over a decade, he was an artist and supervisor at Industrial Light and Magic, and in 2007 became a freelance visual effects supervisor.  He worked on "Journey to the Center of the Earth", the first ever stereoscopic motion picture shot and released digitally, "Wolverine", "Ninja Assassin", "" and "".  He was nominated for a BAFTA and an Academy Award for Best Visual Effects for his work on "Iron Man 3", oversaw nearly 3000 shots on "" and was the overall supervisor for "Guardians of the Galaxy Vol.  2".  In 2015 he was given an Honorary Doctor of Arts degree by his alma mater, Coventry University.

Ex Machina (film): Ex Machina (stylized as ex_machina or EX_MACHINA) is a 2015 independent science fiction psychological thriller film written and directed by Alex Garland (in his directorial debut) and stars Domhnall Gleeson, Oscar Isaac and Alicia Vikander.  The film follows a programmer who is invited by his CEO to administer the Turing test to an intelligent humanoid robot.

Paul Franklin (visual effects supervisor): Paul J. Franklin is an English visual effects supervisor who has worked with visual effects since the 1990s.  He is known for his long-running working relationship with director Christopher Nolan which dates back to "Batman Begins" (2005).  Franklin won the Academy Award for Best Visual Effects and the BAFTA Award for Best Special Visual Effects for "Inception" (2010), and won a second Academy Award for Best Visual Effects for "Interstellar" (2014).  He shared the wins with Andrew Lockley, Peter Bebb, and Chris Corbould.  Franklin has also been nominated for an Academy Award for "The Dark Knight" (2008).  He was nominated for BAFTA Awards for "Batman Begins", "The Dark Knight" (2008), and "The Dark Knight Rises" (2012).

Gareth Edwards (director): Gareth James Edwards (born 1 June 1975) is an English film director, film producer, screenwriter, cinematographer, production designer, and visual effects artist.  He first gained widespread recognition for "Monsters" (2010), an independent film in which he served as writer, director, cinematographer, and visual effects artist.  He subsequently directed the 2014 reboot of "Godzilla", and the epic space opera film "Rogue One: A Star Wars Story" (2016), the first in the "Star Wars Anthology" series.

AACTA Award for Best Visual Effects or Animation: The AACTA Award for Best Visual Effects or Animation (previously Best Visual Effects) is an award presented by the Australian Academy of Cinema and Television Arts (AACTA) for achievements in visual effects in film, television, documentary and short film.  The award was first presented by the Australian Film Institute (AFI)at the Australian Film Institute Awards (known commonly as the AFI Awards) from 2006-2010, prior to the establishment of the Academy.  In 2014 the award for Best Visual Effects was renamed Best Visual Effects or Animation.  Additionally, this category is now open to any film, television or documentary production, regardless of geography, which has had 100% of its visual effects and animation made in Australia.

Carey Villegas: Carey Villegas is a visual effects artist who was nominated at the 83rd Academy Awards in the category of Best Visual Effects, for the film "Alice in Wonderland".  His nomination was shared with Sean Phillips, Ken Ralston and David Schaub.  Also for Alice in Wonderland, Carey won the 2010 Golden Satellite Award for Best Visual Effects and was nominated for the British Academy Award (BAFTA), Critics Choice Award, Saturn Award, and the Visual Effects Society Award (VES) for "Outstanding Visual Effects in a Visual Effects Driven Motion Picture".

Supporting paragraphs: Sara Bennett Ex Machina (film)
Answer: Ex Machina