Question: how many scheduled tribes are there in india
[{'answer': '645'}, {'provenance': [{'wikipedia_id': '1703200', 'title': 'List of Scheduled Tribes in India', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 185, 'bleu_score': 0.595678146626999, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14319228508007997335}, 'section': 'Section::::Abstract.'}]}]