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In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.

Ankara ( ; ] ), formerly known as Ancyra (Greek: ) and Angora, is the capital of the Republic of Turkey. With a population of 4,587,558 in the urban center and 5,150,072 in its province , it is Turkey's second largest city after former imperial capital Istanbul, having overtaken Izmir. The former Metropolitan archbishopric remains a triple titular see (Latin, Armenian Catholic and Orthodox). Question: The city where Turkish Statistical Institute has its headquarters in has a population of what in the urban center? Answer: 4,587,558
Output:
With a population of 4,587,558 in the urban center and 5,150,072 in its province , it is Turkeys second largest city after former imperial capital Istanbul, having overtaken Izmir.