Question: when is mother day celebrated in the united states
[{'answer': 'the second Sunday in May', 'provenance': [{'wikipedia_id': '1546634', 'title': "Mother's Day (United States)", 'start_paragraph_id': 1, 'start_character': 69, 'end_paragraph_id': 1, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1546634', 'title': "Mother's Day (United States)", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 543, 'bleu_score': 0.9511135937842321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15592811528456862380}, 'section': 'Section::::Abstract.'}]}]