Which is the second-largest city in the Organisation of Islamic Cooperation (OIC) member countries?

Explanation
List of TOP 10 largest Islamic Countries Cities Rank City Country 1 Jakarta,  Indonesia 2 Dhaka,  Bangladesh 3 Karachi,  Pakistan 4 Greater Cairo  Egypt 5 Lagos  Nigeria 6 Istanbul  Turkey 7 Tehran  Iran 8 Lahore  Pakistan 9 Bandung  Indonesia 10 Faisalabad  Pakistan