Question: At the 13th César Awards, a film by what director won the award for Best Film?
Sentence (from "13th César Awards"): The 13th César Awards ceremony, presented by the Académie des Arts et Techniques du Cinéma, honoured the best French films of 1987 and took place on 12 March 1988 at the Palais des Congrès in Paris.
Relevant evidence: No