Question: who plays james halliday in ready player one
[{'answer': 'Mark Rylance', 'provenance': [{'wikipedia_id': '46270306', 'title': 'Ready Player One (film)', 'start_paragraph_id': 1, 'start_character': 291, 'end_paragraph_id': 1, 'end_character': 303, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]