Who amongst the following Sultans built the fifth storey of Qutb Minar?

Who among the following did not contribute to building the famous ‘Qutb-Minar’?

Who among the following Sultanate rulers was of Afghan origin?

Who among the following established Delhi as the capital of Sultanate?

Who among the following started ‘Tanka’ silver coin?

Who among the following opposed the power of the Khalifa?