Question: when did the first avengers infinity war trailer come out
[{'answer': 'November 29 , 2017', 'provenance': [{'wikipedia_id': '44240443', 'title': 'Avengers: Infinity War', 'start_paragraph_id': 51, 'start_character': 268, 'end_paragraph_id': 51, 'end_character': 286, 'bleu_score': 1.0, 'section': 'Section::::Marketing.\n'}]}, {'provenance': [{'wikipedia_id': '44240443', 'title': 'Avengers: Infinity War', 'start_paragraph_id': 51, 'start_character': 0, 'end_paragraph_id': 51, 'end_character': 1950, 'bleu_score': 0.6709662842803, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14887181547321546940}, 'section': 'Section::::Marketing.\n'}]}]