Question: the first unix operating system was written in which language
[{'answer': 'assembly', 'provenance': [{'wikipedia_id': '21347364', 'title': 'Unix', 'start_paragraph_id': 15, 'start_character': 47, 'end_paragraph_id': 15, 'end_character': 55, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '21347364', 'title': 'Unix', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 375, 'bleu_score': 0.5435380582089431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3865821160283080667}, 'section': 'Section::::History.\n'}]}]