Question: who became the first president of the bhartiya janta party
[{'answer': 'Atal Bihari Vajpayee', 'provenance': [{'wikipedia_id': '45309831', 'title': 'List of Presidents of the Bharatiya Janata Party', 'start_paragraph_id': 4, 'start_character': 38, 'end_paragraph_id': 4, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]