I want to know the answer to the following question:
From the 2011 census, London is second in population in the EU to which city?
All the background I'm provided with is that "The city's metropolitan area is one of the most populous in Europe with 13,879,757 inhabitants,[note 4] while the Greater London Authority states the population of the city-region (covering a large part of the south east) as 22.7 million.". Is that enough to answer the question?