Question: what is the strongest type of nuclear bomb
[{'answer': 'hydrogen bomb', 'provenance': [{'wikipedia_id': '92214', 'title': 'Tsar Bomba', 'start_paragraph_id': 1, 'start_character': 19, 'end_paragraph_id': 1, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]