Question: where does citric acid cycle take place in mitochondria
[{'answer': 'matrix of the mitochondrion', 'provenance': [{'wikipedia_id': '6818', 'title': 'Citric acid cycle', 'start_paragraph_id': 3, 'start_character': 57, 'end_paragraph_id': 3, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6818', 'title': 'Citric acid cycle', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 364, 'bleu_score': 0.965203995518735, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10366896758583966103}, 'section': 'Section::::Abstract.'}]}]