Question: who was the first national chairman of the proscribed social democratic party
[{'answer': 'Babagana Kingibe', 'provenance': [{'wikipedia_id': '9612672', 'title': 'Social Democratic Party (Nigeria)', 'start_paragraph_id': 3, 'start_character': 339, 'end_paragraph_id': 3, 'end_character': 355, 'bleu_score': 1.0, 'section': 'Section::::Structure.\n'}]}]