Question: when did the modern slavery act come into force
[{'answer': '26 March 2015', 'provenance': [{'wikipedia_id': '44456149', 'title': 'Modern Slavery Act 2015', 'start_paragraph_id': 1, 'start_character': 508, 'end_paragraph_id': 1, 'end_character': 521, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44456149', 'title': 'Modern Slavery Act 2015', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 521, 'bleu_score': 0.950027409461844, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10746661065485152559}, 'section': 'Section::::Abstract.'}]}]