Question: What nationality is the actress who played Sylvia in a film which follows Marcello Rubini, a journalist writing for gossip magazines, over seven days and nights on his journey through the "sweet life" of Rome in a fruitless search for love and happiness?
{'answer': 'Swedish', 'supporting_facts': [['Anita Ekberg', 0], ['Anita Ekberg', 1], ['La Dolce Vita', 1]]}