Question: who become the first president of the bharatiya janata party
[{'answer': 'Atal Bihari Vajpayee', 'provenance': [{'wikipedia_id': '149330', 'title': 'Bharatiya Janata Party', 'start_paragraph_id': 3, 'start_character': 124, 'end_paragraph_id': 3, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '149330', 'title': 'Bharatiya Janata Party', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 703, 'bleu_score': 0.8608596399861561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3551543460502245753}, 'section': 'Section::::Abstract.'}]}]