Question: what's the tallest roller coaster in the uk
[{'answer': 'Big One', 'provenance': [{'wikipedia_id': '1749172', 'title': 'Big One (roller coaster)', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]