Question: Who chaired the ceremony in which the film written by Canet and Philippe Lefebvre won the award for Best Film?
Context: Paris by Night (French: "Une nuit" ) is a 2012 French crime film directed by Philippe Lefebvre. The 37th César Awards ceremony, presented by the French Academy of Cinema Arts and Techniques (Académie des Arts et Techniques du Cinéma), was held on 24 February 2012, at the Théâtre du Châtelet in Paris.  The awards honoured the best films of 2011. " The Artist" won six out of its ten nominations, including Best Film, Best Director (Michel Hazanavicius), Best Actress (Bérénice Bejo), and Best Cinematography (Guillaume Schiffman).  The ceremony was chaired by Guillaume Canet, with Antoine de Caunes as master of ceremonies.  Nominations were announced 27 January 2012. The 21st César Awards ceremony, presented by the Académie des Arts et Techniques du Cinéma, honoured the best French films of 1995 and took place on 3 February 1996 at the Théâtre des Champs-Élysées in Paris.  The ceremony was chaired by Philippe Noiret and hosted by Antoine de Caunes. " La Haine" won the award for Best Film. Last Night is a 2010 drama romance film written and directed by Massy Tadjedin.  It stars Keira Knightley, Sam Worthington, Eva Mendes, and Guillaume Canet.  The film's official trailer was released on November 6, 2010.  It was released both in theaters and video-on-demand on May 6, 2011 in the United States.  The film centers on Joanna (Keira Knightley) and Michael Reed (Sam Worthington), a successful and happy couple.  They are moving along in their lives together until Joanna meets Laura (Eva Mendes), the stunningly beautiful colleague whom Michael never mentioned.  While Michael is away with Laura on a business trip, Joanna runs into an old but never quite forgotten love, Alex (Guillaume Canet).  As the night progresses and temptation increases, each must confront who they really are. The 12th Lumières Awards ceremony, presented by the Académie des Lumières, was held on 5 February 2007, at the Espace Pierre Cardin in Paris.  The ceremony was chaired by Isabelle Mergault. " Tell No One" won the award for Best Film. The ARY Film Award for Best Film Jury is one of the ARY Film Awards of Merit presented annually by the ARY Digital Network and Entertainment Channel to producers working in the film industry and is the only category in which every member is eligible to submit a nomination.  Best Film Jury is considered the most important of the ARY Film Awards, as it represents all the directing, acting, music composing, writing, editing and other efforts put forth into a drama.  This award is one of the two Best Film awards in ceremony which is awarded to relevant film only on the decision of ceremony Jury, while other being awarded on Viewers Voting's. The ARY Film Award for Best Film is one of the ARY Film Awards of Merit presented annually by the ARY Digital Network and Entertainment Channel to producers working in the film industry and is the only category in which every member is eligible to submit a nomination.  Best Film is considered the most important of the ARY Film Awards, as it represents all the directing, acting, music composing, writing, editing and other efforts put forth into a drama.  This award is one of the two Best Film awards in ceremony which is awarded to relevant film only on the decision of ceremony Jury, while other being awarded on Viewers Voting's. The Judge (French: "le juge" ) is a 1984 French crime drama film directed by Philippe Lefebvre. Tell No One (French: "Ne le dis à personne" ) is a 2006 French thriller film directed by Guillaume Canet and based on the novel of the same name by Harlan Coben.  Written by Canet and Philippe Lefebvre and starring François Cluzet, the film won four categories at the 2007 César Awards in France: Best Director (Guillaume Canet), Best Actor (François Cluzet), Best Editing and Best Music Written for a Film. The 2nd Lumières Awards ceremony, presented by the Académie des Lumières, was held on 13 February 1997.  The ceremony was chaired by Philippe Noiret. " Ridicule" won three awards including Best Film, Best Actor and Best Actress.
Answer: Isabelle Mergault