Please answer this: What is the question to: "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 ."? The topic is Osaka.
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Answer: "where is osaka japan?"

Please answer this: What is the question to: "The seven SI base units and the interdependency of their definitions: for example, to extract the definition of the metre from the speed of light , the definition of the second must be known while the ampere and candela are both dependent on the definition of energy which in turn is defined in terms of length , mass and time ."? The topic is SI base unit.
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Answer: "what is a base SI unit?"

Please answer this: What is the question to: "After Harris' death, Michael Gambon portrayed Dumbledore for all of the remaining films."? The topic is Albus Dumbledore.
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Answer:
"who played dumbledore in harry potter?"