Question: who played superman's mother in the 1978 movie
[{'answer': 'Susannah York', 'provenance': [{'wikipedia_id': '362719', 'title': 'Superman (1978 film)', 'start_paragraph_id': 27, 'start_character': 12, 'end_paragraph_id': 27, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}, {'provenance': [{'wikipedia_id': '362719', 'title': 'Superman (1978 film)', 'start_paragraph_id': 27, 'start_character': 0, 'end_paragraph_id': 27, 'end_character': 187, 'bleu_score': 0.9321022168949711, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7164443707619467849}, 'section': 'Section::::Cast.\n'}]}]