Question: the sandhu bat island on which the statue of unity is to be built is located on which river
[{'answer': 'Narmada River', 'provenance': [{'wikipedia_id': '29108553', 'title': 'Statue of Unity', 'start_paragraph_id': 24, 'start_character': 257, 'end_paragraph_id': 24, 'end_character': 270, 'bleu_score': 1.0, 'section': 'Section::::Features.\n'}]}]