Question: when was the hitchhiker's guide to the galaxy first published
[{'answer': '12 October 1979', 'provenance': [{'wikipedia_id': '478921', 'title': "The Hitchhiker's Guide to the Galaxy (novel)", 'start_paragraph_id': 1, 'start_character': 291, 'end_paragraph_id': 1, 'end_character': 306, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '478921', 'title': "The Hitchhiker's Guide to the Galaxy (novel)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 356, 'bleu_score': 0.9318557434050331, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9060024252225703799}, 'section': 'Section::::Abstract.'}]}]