Question: where does the calvin cycle (dark reactions) take place
[{'answer': 'in the stroma', 'provenance': [{'wikipedia_id': '1104705', 'title': 'Calvin cycle', 'start_paragraph_id': 1, 'start_character': 260, 'end_paragraph_id': 1, 'end_character': 273, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1104705', 'title': 'Calvin cycle', 'start_paragraph_id': 1, 'start_character': 66, 'end_paragraph_id': 1, 'end_character': 660, 'bleu_score': 0.83759658926632, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5873742181287670950}, 'section': 'Section::::Abstract.'}]}]