Question: when did the first curious george book come out
[{'answer': '1939', 'provenance': [{'wikipedia_id': '752247', 'title': 'Curious George', 'start_paragraph_id': 2, 'start_character': 82, 'end_paragraph_id': 2, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '752247', 'title': 'Curious George', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 466, 'bleu_score': 0.9304844600065421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12115724188316840596}, 'section': 'Section::::Abstract.'}]}]