Question: how long is the freedom trail in miles
[{'answer': '2.5'}, {'provenance': [{'wikipedia_id': '1115490', 'title': 'Freedom Trail', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 747, 'bleu_score': 0.9304719420045001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16824587681441006881}, 'section': 'Section::::Abstract.'}]}]