Question: what is the control centre of a cell
[{'answer': 'the nucleus', 'provenance': [{'wikipedia_id': '6235', 'title': 'Cell nucleus', 'start_paragraph_id': 2, 'start_character': 441, 'end_paragraph_id': 2, 'end_character': 452, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6235', 'title': 'Cell nucleus', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 857, 'bleu_score': 0.882193936136284, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18115255830539056512}, 'section': 'Section::::Abstract.'}]}]