Question: when did justin biebers song baby come out
[{'answer': 'January 18 , 2010', 'provenance': [{'wikipedia_id': '25788953', 'title': 'Baby (Justin Bieber song)', 'start_paragraph_id': 2, 'start_character': 41, 'end_paragraph_id': 2, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25788953', 'title': 'Baby (Justin Bieber song)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 295, 'bleu_score': 0.5795015720426231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10389754531511995843}, 'section': 'Section::::Abstract.'}]}]