Q: What is the question to: "Ethnicity or ethnic group is a socially defined category based on common culture or nationality ."? The topic is Ethnic group.
A: "what are the characteristics of an ethnic group?"

Q: What is the question to: "Madrid (, ) is the capital and largest city of Spain ."? The topic is Madrid.
A: "what country is madrid spain in?"

Q: What is the question to: "Enigma is an electronic musical project founded in Germany by Michael Cretu , David Fairstein and Frank Peterson in 1990."? The topic is Enigma (musical project).
A: "who is the group enigma?"

Q: What is the question to: "Washington, D.C. has been the capital of the United States since 1800."? The topic is List of capitals in the United States.
A:
"what state is the capital in?"