Question: what are the two shockable rhythms in cardiac arrest
[{'answer': 'ventricular fibrillation', 'provenance': [{'wikipedia_id': '60575', 'title': 'Cardiac arrest', 'start_paragraph_id': 2, 'start_character': 321, 'end_paragraph_id': 2, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'pulseless ventricular tachycardia', 'provenance': [{'wikipedia_id': '60575', 'title': 'Cardiac arrest', 'start_paragraph_id': 53, 'start_character': 270, 'end_paragraph_id': 53, 'end_character': 303, 'bleu_score': 1.0, 'section': 'Section::::Diagnosis.:Classifications.\n'}]}, {'provenance': [{'wikipedia_id': '60575', 'title': 'Cardiac arrest', 'start_paragraph_id': 53, 'start_character': 0, 'end_paragraph_id': 53, 'end_character': 388, 'bleu_score': 0.96188712955549, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15432335204445241021}, 'section': 'Section::::Diagnosis.:Classifications.\n'}]}]