Question: which is the highest selling movie of all time
[{'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.'}]}, {'provenance': [{'wikipedia_id': '59892', 'title': 'List of highest-grossing films', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 1208, 'bleu_score': 0.9373365003476141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11760745292962990068}, 'section': 'Section::::Highest-grossing films.\n'}]}]