Question: who played greg's mom on american housewife
[{'answer': 'Julia Duffy', 'provenance': [{'wikipedia_id': '50579150', 'title': 'American Housewife', 'start_paragraph_id': 39, 'start_character': 12, 'end_paragraph_id': 39, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Cast and characters.:Notable Guests.\n'}]}, {'provenance': [{'wikipedia_id': '50579150', 'title': 'American Housewife', 'start_paragraph_id': 39, 'start_character': 0, 'end_paragraph_id': 39, 'end_character': 53, 'bleu_score': 0.7598356856515921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14488314541563031686}, 'section': 'Section::::Cast and characters.:Notable Guests.\n'}]}]