What is the question to: "The liver produces urea in the urea cycle as a waste product of the digestion of protein ."? The topic is Blood urea nitrogen.
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Answer: "what is blood urea?"


What is the question to: "The Romanian-born Cretu conceived the Enigma project while working in Germany, but based his recording studio A.R.T. Studios in Ibiza, Spain , from the early 1990s until May 2009, where he has recorded all of Enigma's studio releases to date."? The topic is Enigma (musical project).
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Answer: "who is the group enigma?"


What is the question to: "A mnemonic (, with a silent "m"), or mnemonic device, is any learning technique that aids information retention."? The topic is Mnemonic.
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Answer:
"What Are Mnemonic Devices?"