Read this: George Dayton had founded his Dayton's Dry Goods store in Minneapolis in 1902 and the AMC cooperative in 1912. His descendants built Southdale Center in 1956, opened the Target discount store chain in 1962 and the B. Dalton Bookseller chain in 1966. Dayton's grew to 19 stores under the Dayton's name plus five other regional names acquired by Dayton-Hudson. The Dayton-Hudson Corporation closed the flagship J. L. Hudson Department Store in downtown Detroit in 1983, but expanded its other retail operations. It acquired Mervyn's in 1978, Marshall Field's in 1990, and renamed itself the Target Corporation in 2000. In 2002, Dayton's and Hudson's were consolidated into the Marshall Field's name. In 2005, May Department Stores acquired all of the Marshall Field's stores and shortly thereafter, Macy's acquired May.

What store did the Dayton-Hudson Corporation purchase in 1978?
What is the answer? (If it cannot be answered, return "unanswerable")
Mervyn's