Question: who is the current managing director of nnpc
[{'answer': 'Dr. Maikanti Baru', 'provenance': [{'wikipedia_id': '3950337', 'title': 'Nigerian National Petroleum Corporation', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Leadership.\n'}]}, {'provenance': [{'wikipedia_id': '3950337', 'title': 'Nigerian National Petroleum Corporation', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 253, 'bleu_score': 0.506324877446238, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12420018561109256153}, 'section': 'Section::::Leadership.\n'}]}]