Question: what is the beginning of avengers infinity war
[{'answer': 'Avengers : Age of Ultron', 'provenance': [{'wikipedia_id': '44240443', 'title': 'Avengers: Infinity War', 'start_paragraph_id': 68, 'start_character': 683, 'end_paragraph_id': 68, 'end_character': 707, 'bleu_score': 1.0, 'section': 'Section::::Reception.:Box office.:Pre-sale ticket records.\n'}]}, {'provenance': [{'wikipedia_id': '44240443', 'title': 'Avengers: Infinity War', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 880, 'bleu_score': 0.89626024855341, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5851226587528415965}, 'section': 'Section::::Abstract.'}]}]