Question: when did the heart become associated with love
[{'answer': 'the 1250s', 'provenance': [{'wikipedia_id': '2414831', 'title': 'Heart (symbol)', 'start_paragraph_id': 8, 'start_character': 75, 'end_paragraph_id': 8, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::History.:Earliest use.\n'}]}, {'provenance': [{'wikipedia_id': '2414831', 'title': 'Heart (symbol)', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1808, 'bleu_score': 0.9936406188971431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18347856389992481156}, 'section': 'Section::::History.:Earliest use.\n'}]}]