Question: who plays the khal in game of thrones
[{'answer': 'Joseph Jason Namakaeha Momoa', 'provenance': [{'wikipedia_id': '2032324', 'title': 'Jason Momoa', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]