Question: when did sir arthur conan doyle wrote his first book
[{'answer': '1887', 'provenance': [{'wikipedia_id': '18951335', 'title': 'Arthur Conan Doyle', 'start_paragraph_id': 1, 'start_character': 186, 'end_paragraph_id': 1, 'end_character': 190, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18951335', 'title': 'Arthur Conan Doyle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 407, 'bleu_score': 0.744742487859101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7752603143636883461}, 'section': 'Section::::Abstract.'}]}]