Which province of Pakistan is called the Bab-ul-Islam?

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Which province of Pakistan is called the Bab-ul-Islam? Answer: Sindh

Sindh is called the "Bab-ul-Islam" (باب الاسلام), which means "Gateway to Islam", because: It was the first region in the Indian subcontinent where Islam was introduced. This occurred after the Umayyad Caliphate's conquest under Muhammad Bin Qasim in 712 AD.