Question: what is the name of dye used in coronary angiography
[{'answer': 'CT - visible dye', 'provenance': [{'wikipedia_id': '582832', 'title': 'Coronary catheterization', 'start_paragraph_id': 39, 'start_character': 187, 'end_paragraph_id': 39, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::Alternative approaches.\n'}]}, {'provenance': [{'wikipedia_id': '582832', 'title': 'Coronary catheterization', 'start_paragraph_id': 39, 'start_character': 0, 'end_paragraph_id': 39, 'end_character': 746, 'bleu_score': 0.983804329702269, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4391524947465799893}, 'section': 'Section::::Alternative approaches.\n'}]}]