It must be "the", but I'm not sure. Am I right? "
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MustAsk HiWhat is the/a device called that creates...It must be "the", but I'm not sure. Am I right?If you have a particular device in mind, and are trying to remember its name, then use "the."
MustAskJust to sure, "What is a building called that is divided into apartments?" is correctYes.