Question: who was the peace negotiator for the north vietnamese
[{'answer': 'Lê Đức Thọ', 'provenance': [{'wikipedia_id': '669964', 'title': 'Paris Peace Accords', 'start_paragraph_id': 2, 'start_character': 397, 'end_paragraph_id': 2, 'end_character': 407, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '669964', 'title': 'Paris Peace Accords', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 520, 'bleu_score': 0.976043556018343, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12412624665559664014}, 'section': 'Section::::Abstract.'}]}]