Question: in response to an acute stressor epinephrine is released from which structure
[{'answer': 'the adrenal medulla', 'provenance': [{'wikipedia_id': '470843', 'title': 'Fight-or-flight response', 'start_paragraph_id': 1, 'start_character': 422, 'end_paragraph_id': 1, 'end_character': 441, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '470843', 'title': 'Fight-or-flight response', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 711, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9700439551593341564}, 'section': 'Section::::Abstract.'}]}]