Question: what type of nuclear bomb was developed by the united states in 1954
[{'answer': 'thermonuclear weapon', 'provenance': [{'wikipedia_id': '22330724', 'title': 'Timeline of nuclear weapons development', 'start_paragraph_id': 106, 'start_character': 79, 'end_paragraph_id': 106, 'end_character': 99, 'bleu_score': 1.0, 'section': 'Section::::1950–1960.\n'}]}, {'provenance': [{'wikipedia_id': '22330724', 'title': 'Timeline of nuclear weapons development', 'start_paragraph_id': 106, 'start_character': 0, 'end_paragraph_id': 106, 'end_character': 256, 'bleu_score': 0.7606864622448941, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17341711903694802269}, 'section': 'Section::::1950–1960.\n'}]}]