Question: who played alan bennett's mother in the lady in the van
[{'answer': 'Maggie Smith', 'provenance': [{'wikipedia_id': '44987041', 'title': 'The Lady in the Van', 'start_paragraph_id': 1, 'start_character': 98, 'end_paragraph_id': 1, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]