Statistics for Choose the most populous city

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Question	Answer	% Correct
Which has the greatest urban population?	Boston	78%
Which has the greatest urban population?	Madrid	78%
Which has the greatest urban population?	Shanghai	78%
Which has the greatest urban population?	Ho Chi Minh City	72%
Which has the greatest urban population?	Baghdad	67%
Which has the greatest urban population?	Buenos Aires	67%
Which has the greatest urban population?	Montreal	56%
Which has the greatest urban population?	Cairo	28%
Which has the greatest urban population?	Jakarta	28%
Which has the greatest urban population?	Philadelphia	22%