Question: when did dr seuss start writing children's books
[{'answer': '1937', 'provenance': [{'wikipedia_id': '8855', 'title': 'Dr. Seuss', 'start_paragraph_id': 2, 'start_character': 519, 'end_paragraph_id': 2, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8855', 'title': 'Dr. Seuss', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 897, 'bleu_score': 0.7837954213447761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9192059435520298453}, 'section': 'Section::::Abstract.'}]}]