Question: when were child benefits introduced in the uk
[{'answer': '1909', 'provenance': [{'wikipedia_id': '39018238', 'title': 'Child benefits in the United Kingdom', 'start_paragraph_id': 3, 'start_character': 56, 'end_paragraph_id': 3, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::The child tax allowance.\n'}]}, {'provenance': [{'wikipedia_id': '39018238', 'title': 'Child benefits in the United Kingdom', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 847, 'bleu_score': 0.9647750459185931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12495392243101434735}, 'section': 'Section::::The child tax allowance.\n'}]}]