Question: who invented the abiocor artificial heart and what year was it invented
[{'answer': 'AbioMed , Inc.', 'provenance': [{'wikipedia_id': '1025612', 'title': 'AbioCor', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': '1998', 'provenance': [{'wikipedia_id': '1025612', 'title': 'AbioCor', 'start_paragraph_id': 4, 'start_character': 96, 'end_paragraph_id': 4, 'end_character': 100, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '1025612', 'title': 'AbioCor', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 563, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3081652207886776972}, 'section': 'Section::::History.\n'}]}]