Question: what is the movie with the highest box office
[{'answer': 'Avatar', 'provenance': [{'wikipedia_id': '59892', 'title': 'List of highest-grossing films', 'start_paragraph_id': 2, 'start_character': 943, 'end_paragraph_id': 2, 'end_character': 949, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]