Question: who built the fifth floor of qutub minar
[{'answer': 'Firoz Shah Tughlaq', 'provenance': [{'wikipedia_id': '799638', 'title': 'Qutb Minar', 'start_paragraph_id': 2, 'start_character': 270, 'end_paragraph_id': 2, 'end_character': 288, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '799638', 'title': 'Qutb Minar', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 641, 'bleu_score': 0.541849968352481, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12727970015183674811}, 'section': 'Section::::Abstract.'}]}]