Question: who appoints chief of army staff in pakistan
[{'answer': 'the Prime Minister of Pakistan', 'provenance': [{'wikipedia_id': '7790064', 'title': 'Chief of Army Staff (Pakistan)', 'start_paragraph_id': 1, 'start_character': 180, 'end_paragraph_id': 1, 'end_character': 210, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '7790064', 'title': 'Chief of Army Staff (Pakistan)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 262, 'bleu_score': 0.844325865339244, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13669083326302493914}, 'section': 'Section::::Abstract.'}]}]