Question: who plays the mom of betty in riverdale
[{'answer': 'Mädchen Amick', 'provenance': [{'wikipedia_id': '49281386', 'title': 'Riverdale (2017 TV series)', 'start_paragraph_id': 2, 'start_character': 548, 'end_paragraph_id': 2, 'end_character': 561, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]