Question: what is proposed to be at the center of our galaxy
[{'answer': 'a supermassive black hole', 'provenance': [{'wikipedia_id': '373352', 'title': 'Galactic Center', 'start_paragraph_id': 18, 'start_character': 222, 'end_paragraph_id': 18, 'end_character': 247, 'bleu_score': 1.0, 'section': 'Section::::Supermassive black hole.\n'}]}, {'provenance': [{'wikipedia_id': '373352', 'title': 'Galactic Center', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 371, 'bleu_score': 0.696255201796791, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1989386676004503718}, 'section': 'Section::::Abstract.'}]}]