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Which of the following defines a "mortgage loan"?

A: An instrument that is used only in the exchange of real property; B: A financial obligation which is unsecured but is used to buy a building; C: A promissory note that is unpaid; D: A loan collateralized with real estate.

Prior to the economic crisis of 1997-1998, the South Korea's "chaebol" had become bloated and heavily in debt

Indicate whether the statement is true or false