Question: where does the myocardium receives oxygenated blood from
[{'answer': 'Coronary arteries', 'provenance': [{'wikipedia_id': '146642', 'title': 'Coronary circulation', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '146642', 'title': 'Coronary circulation', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 718, 'bleu_score': 0.9832621206481431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1391762045819270080}, 'section': 'Section::::Structure.\n'}]}]