Question: who plays gregor clegane on game of thrones
[{'answer': 'Hafþór Júlíus Björnsson', 'provenance': [{'wikipedia_id': '28344747', 'title': 'Hafþór Júlíus Björnsson', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28344747', 'title': 'Hafþór Júlíus Björnsson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 419, 'bleu_score': 0.7186257267509071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16783686243369057811}, 'section': 'Section::::Abstract.'}]}]