Who among the following was not a slave before he became a king ___ ?

A.  Ala-ud-Din khilji

B.  Balban

C.  Qutub_ud_Din Aibak

D.  Iltutmish

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Which Province of Pakistan is called Bab-ul-Islam_____?

A Balochistan B Punjab C Sindh D K.P.K