Question: Who chaired the ceremony in which the film written by Canet and Philippe Lefebvre won the award for Best Film?
Sentence (from "Tell No One"): 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.
Relevant evidence: Yes