Question: who was the first postmaster general of the united states
[{'answer': 'Benjamin Franklin', 'provenance': [{'wikipedia_id': '45556', 'title': 'United States Postmaster General', 'start_paragraph_id': 4, 'start_character': 137, 'end_paragraph_id': 4, 'end_character': 154, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '45556', 'title': 'United States Postmaster General', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 265, 'bleu_score': 0.9529077664391161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2767056320190091894}, 'section': 'Section::::History.\n'}]}]