Cologne and Dusseldorf are two different cities which shouldn't be counted as one!
Also Cologne has about 1million inhabitants and Düsseldorf about 600.000, which concludes to 1,6 million, which is still only half of Berlins population!
Santa Cruz is the city with the largest population in Bolivia, whether measured by city proper or urban/metropolitan area and hence shouldn't be in this quiz.
There's multiple mistakes here. Melbourne is bigger than Sydney by now and there is no metric by which Berlin is the second biggest city in Germany. The second biggest city is, depending on what metric you choose, either Hamburg or Frankfurt.
Also Cologne has about 1million inhabitants and Düsseldorf about 600.000, which concludes to 1,6 million, which is still only half of Berlins population!
Please check and correct this! :)
Never claim this when you are in one of those two cities, you might get tarred and feathered!
And for the biggest and second biggest cities:
Berlin is by far the biggest city in Germany,
the second biggest by city proper would be Hamburg