Question: who was the programmer of ms-dos operating system
[{'answer': 'Tim Paterson', 'provenance': [{'wikipedia_id': '21291954', 'title': 'MS-DOS', 'start_paragraph_id': 5, 'start_character': 83, 'end_paragraph_id': 5, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '21291954', 'title': 'MS-DOS', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 834, 'bleu_score': 0.8964083161845761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8864811796938239233}, 'section': 'Section::::History.\n'}]}]