Question: what is the highest grossing box office film of all time
[{'answer': 'Gone with the Wind', 'provenance': [{'wikipedia_id': '59892', 'title': 'List of highest-grossing films', 'start_paragraph_id': 3, 'start_character': 649, 'end_paragraph_id': 3, 'end_character': 667, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]