Question: What is the second profession of the Mexican ballerina best known for the Tchaikovsky ballet that initially failed?
Sentence (from "Valentina Kozlova"): In 1979, while on tour as a young principal dancer with the Bolshoi Ballet, Kozlova defected to the United States, where she became a principal dancer with New York City Ballet and later, opened her own ballet school.
Relevant evidence: No