Question: the earliest surviving building in india containing a true dome is
[{'answer': 'Alai Darwaza', 'provenance': [{'wikipedia_id': '20832021', 'title': 'Tomb of Balban', 'start_paragraph_id': 1, 'start_character': 377, 'end_paragraph_id': 1, 'end_character': 389, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20832021', 'title': 'Tomb of Balban', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 750, 'bleu_score': 0.890101038085868, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8394005721617383140}, 'section': 'Section::::Abstract.'}]}]