Question: who was mantis in guardians of the galaxy 2
[{'answer': 'Pom Klementieff', 'provenance': [{'wikipedia_id': '3134418', 'title': 'Mantis (Marvel Comics)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]