Question: the silver coin used as currency during delhi sultanate
[{'answer': 'tanka', 'provenance': [{'wikipedia_id': '53191054', 'title': 'History of the taka', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '53191054', 'title': 'History of the taka', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 959, 'bleu_score': 0.7397451041039, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1648458351254268464}, 'section': 'Section::::South Asia.\n'}]}]