Question: who built the stupa at sanchi in madhya pradesh
[{'answer': 'emperor Ashoka', 'provenance': [{'wikipedia_id': '275014', 'title': 'Sanchi', 'start_paragraph_id': 1, 'start_character': 378, 'end_paragraph_id': 1, 'end_character': 392, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '275014', 'title': 'Sanchi', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1110, 'bleu_score': 0.9020426087053011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11158589844624270372}, 'section': 'Section::::Abstract.'}]}]