Question: who has the power to propose amendments to the u.s. constitution
[{'answer': 'either by the Congress', 'provenance': [{'wikipedia_id': '31650', 'title': 'Article Five of the United States Constitution', 'start_paragraph_id': 2, 'start_character': 27, 'end_paragraph_id': 2, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'or by a convention of states'}, {'provenance': [{'wikipedia_id': '31650', 'title': 'Article Five of the United States Constitution', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 810, 'bleu_score': 0.7429402018508751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15403450582273607182}, 'section': 'Section::::Abstract.'}]}]