Question: who plays desmond's mom in hacksaw ridge
[{'answer': 'Rachel Griffiths', 'provenance': [{'wikipedia_id': '44490039', 'title': 'Hacksaw Ridge', 'start_paragraph_id': 1, 'start_character': 636, 'end_paragraph_id': 1, 'end_character': 652, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44490039', 'title': 'Hacksaw Ridge', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 61, 'bleu_score': 0.7598356856515921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1254232000159806975}, 'section': 'Section::::Cast.\n'}]}]