Question: who plays alex's mom in alexa and katie
[{'answer': 'Tiffani Thiessen', 'provenance': [{'wikipedia_id': '53718201', 'title': 'Alexa & Katie', 'start_paragraph_id': 1, 'start_character': 266, 'end_paragraph_id': 1, 'end_character': 282, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]