Question: who invented the first vaccine for hepatitis b
[{'answer': 'Maurice Hilleman', 'provenance': [{'wikipedia_id': '12947073', 'title': 'Hepatitis B vaccine', 'start_paragraph_id': 25, 'start_character': 348, 'end_paragraph_id': 25, 'end_character': 364, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '12947073', 'title': 'Hepatitis B vaccine', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 1083, 'bleu_score': 0.93115905480877, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11486263108853900446}, 'section': 'Section::::History.\n'}]}]