Question: The 70th Cannes Film Festival took place from 17 to 28 May 2017, in Cannes, France featured what opening film, a 2017 French drama film directed by Arnaud Desplechin and starred Mathieu Amalric, Marion Cotillard, Charlotte Gainsbourg and Louis Garrel?
Sentence (from "2017 Cannes Film Festival"): The 70th Cannes Film Festival took place from 17 to 28 May 2017, in Cannes, France.
Relevant evidence: Yes