Question: who plays mantis in guardian of the galaxy 2
[{'answer': 'Pom Klementieff', 'provenance': [{'wikipedia_id': '43209054', 'title': 'Pom Klementieff', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '43209054', 'title': 'Pom Klementieff', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 363, 'bleu_score': 0.627048113769431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15295158370947734667}, 'section': 'Section::::Abstract.'}]}]