Question: qutub minar was completed by which famous ruler
[{'answer': 'Iltutmish', 'provenance': [{'wikipedia_id': '799638', 'title': 'Qutb Minar', 'start_paragraph_id': 2, 'start_character': 171, 'end_paragraph_id': 2, 'end_character': 180, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]