Question: who invented the first printing press in 1450
[{'answer': 'Johannes Gutenberg', 'provenance': [{'wikipedia_id': '23295', 'title': 'Printing press', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23295', 'title': 'Printing press', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 851, 'bleu_score': 0.984904577301502, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17803204088372851389}, 'section': 'Section::::Abstract.'}]}]