Question: who played alan bennetts mother in the lady in the van
[{'answer': 'Gwen Taylor', 'provenance': [{'wikipedia_id': '44987041', 'title': 'The Lady in the Van', 'start_paragraph_id': 13, 'start_character': 12, 'end_paragraph_id': 13, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]