Question: who played merlin in king arthur legend of the sword
[{'answer': 'Kamil Lemieszewski', 'provenance': [{'wikipedia_id': '43679538', 'title': 'King Arthur: Legend of the Sword', 'start_paragraph_id': 33, 'start_character': 12, 'end_paragraph_id': 33, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Cast.\n'}]}]