39244
It is part of the polycentric megacity region Rhine-Ruhr with a population of over 11,000,000 people .
 location: Rhine-Ruhr
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Rhine-Ruhr 
Answer:
 location: Rhine-Ruhr