Question: which pm of pakistan had the shortest tenure
[{'answer': 'I.I. Chundrigar'}, {'provenance': [{'wikipedia_id': '461902', 'title': 'List of Prime Ministers of Pakistan', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 487, 'bleu_score': 0.7720594733349441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14616344475699703995}, 'section': 'Section::::Abstract.'}]}]