Question: who played the little boy in empire of the sun
[{'answer': 'Christian Bale', 'provenance': [{'wikipedia_id': '146077', 'title': 'Empire of the Sun (film)', 'start_paragraph_id': 1, 'start_character': 182, 'end_paragraph_id': 1, 'end_character': 196, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]