Question: Sergei Rachmaninoff's "Prelude in C-sharp minor" which played a prominent part in the detective novel "Overture to Death" was a single part of how many pieces to the ternary prelude he composed titled "Morceaux de fantaisie"?
{'answer': 'five pieces', 'supporting_facts': [['Overture to Death', 1], ['Prelude in C-sharp minor (Rachmaninoff)', 2]]}