Question: How many films did the actress that is starred in the comic play by Noel Coward and is bet known for her outstanding stage triumph in the role of Blanche du Bois, appear in?
Sentence (from "First Pan-African Conference"): Organized primarily by the Trinidadian barrister Henry Sylvester Williams, it took place in Westminster Hall and was attended by 37 delegates and about 10 other participants and observers from Africa, the West Indies, the US and the UK, including Samuel Coleridge Taylor (the youngest delegate), John Alcindor, Dadabhai Naoroji, John Archer, Henry Francis Downing, and W. E. B. Du Bois, with Bishop Alexander Walters of the AME Zion Church taking the chair.
Relevant evidence: No