Question: when was the first x ray machine invented
[{'answer': '1896', 'provenance': [{'wikipedia_id': '34197', 'title': 'X-ray', 'start_paragraph_id': 15, 'start_character': 111, 'end_paragraph_id': 15, 'end_character': 115, 'bleu_score': 1.0, 'section': 'Section::::History.:Discovery by Röntgen.\n'}]}]