Question: who plays mom in the tv show mom
[{'answer': 'Allison Janney', 'provenance': [{'wikipedia_id': '39355235', 'title': 'Mom (TV series)', 'start_paragraph_id': 2, 'start_character': 329, 'end_paragraph_id': 2, 'end_character': 343, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]