Question: Isabelle Guérin received the title of étoile from Rudolf Nureyev, director of the Paris Opera Ballet during what years?
Sentence (from "Rudolf Nureyev"): Rudolf Khametovich Nureyev (Bashkir: Рудольф Хәмит улы Нуриев , Tatar: Рудольф Хәмит улы Нуриев , Russian: Рудо́льф Хаме́тович Нуре́ев ; 17 March 1938 – 6 January 1993) was a Soviet ballet dancer and choreographer.
Relevant evidence: No