Question: who plays elizabeth's grandmother in the crown
[{'answer': 'Eileen Atkins', 'provenance': [{'wikipedia_id': '47048067', 'title': 'The Crown (TV series)', 'start_paragraph_id': 103, 'start_character': 393, 'end_paragraph_id': 103, 'end_character': 406, 'bleu_score': 1.0, 'section': 'Section::::Production.:Casting.\n'}]}]