Question: who played lena in singing in the rain
[{'answer': 'Jean Hagen', 'provenance': [{'wikipedia_id': '1883157', 'title': "Singin' in the Rain", 'start_paragraph_id': 2, 'start_character': 240, 'end_paragraph_id': 2, 'end_character': 250, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1883157', 'title': "Singin' in the Rain", 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 238, 'bleu_score': 0.8444296712777011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12665345513985860319}, 'section': 'Section::::Cast.\n'}]}]