Question: who is the founder of unix operating system
[{'answer': 'Ken Thompson', 'provenance': [{'wikipedia_id': '21347364', 'title': 'Unix', 'start_paragraph_id': 1, 'start_character': 206, 'end_paragraph_id': 1, 'end_character': 218, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Dennis Ritchie', 'provenance': [{'wikipedia_id': '21347364', 'title': 'Unix', 'start_paragraph_id': 1, 'start_character': 220, 'end_paragraph_id': 1, 'end_character': 234, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'others', 'provenance': [{'wikipedia_id': '21347364', 'title': 'Unix', 'start_paragraph_id': 1, 'start_character': 240, 'end_paragraph_id': 1, 'end_character': 246, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21347364', 'title': 'Unix', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 246, 'bleu_score': 0.9046597158307701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4240684342347699924}, 'section': 'Section::::Abstract.'}]}]