
Determine the topic of the question-answer pair.
Question: "where is osaka japan?";  Answer: "is a city in the Kansai region of Japan's main island of Honshu , a designated city under the Local Autonomy Law , the capital city of Osaka Prefecture and also the largest part of the Keihanshin metropolis, which comprises three major cities of Japan, Kyoto , Osaka and Kobe ."? Topic: 