Question: Siobhan Dillon starred in what musical based on Billy Wilder's Academy Award-winning 1950 film of the same title?
Sentence (from "Siobhan Dillon"): Since then, Dillon has performed in the West End, playing the roles of Sandy in "Grease" at the Piccadilly Theatre, Vivienne Kensington in "Legally Blonde" at the Savoy Theatre, Sally Bowles in "Cabaret", Molly in "Ghost the Musical" at the Piccadilly Theatre, Ellen in "Miss Saigon", and Betty Schaefer in "Sunset Boulevard" with the English National Opera.
Relevant evidence: Yes