Question: where is the source of the loire river
[{'answer': 'Massif Central', 'provenance': [{'wikipedia_id': '31464821', 'title': 'Loire', 'start_paragraph_id': 2, 'start_character': 68, 'end_paragraph_id': 2, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]