Question: what is telstar in fifa world cup 2018
[{'answer': 'the official match ball', 'provenance': [{'wikipedia_id': '55756692', 'title': 'Adidas Telstar 18', 'start_paragraph_id': 1, 'start_character': 26, 'end_paragraph_id': 1, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55756692', 'title': 'Adidas Telstar 18', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 321, 'bleu_score': 0.9663744727315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12657051442175572850}, 'section': 'Section::::Abstract.'}]}]