Question: who played lord voldemort in harry potter series
[{'answer': 'Ralph Fiennes', 'provenance': [{'wikipedia_id': '45106', 'title': 'Lord Voldemort', 'start_paragraph_id': 32, 'start_character': 231, 'end_paragraph_id': 32, 'end_character': 244, 'bleu_score': 1.0, 'section': 'Section::::Portrayals within films.\n'}]}]