Question: when did the development of atomic theory begin
[{'answer': '1803', 'provenance': [{'wikipedia_id': '1416046', 'title': 'History of chemistry', 'start_paragraph_id': 74, 'start_character': 3, 'end_paragraph_id': 74, 'end_character': 7, 'bleu_score': 1.0, 'section': 'Section::::19th century.:John Dalton.\n'}]}, {'provenance': [{'wikipedia_id': '1416046', 'title': 'History of chemistry', 'start_paragraph_id': 75, 'start_character': 0, 'end_paragraph_id': 75, 'end_character': 609, 'bleu_score': 0.978138775770484, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9449671335927269842}, 'section': 'Section::::19th century.:John Dalton.\n'}]}]