Question: who plays arthur in arthur and the invisibles
[{'answer': 'Freddie Highmore', 'provenance': [{'wikipedia_id': '2554585', 'title': 'Arthur and the Invisibles', 'start_paragraph_id': 8, 'start_character': 12, 'end_paragraph_id': 8, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]