Translation:Southern food is delicious.
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You can say "Southern food is delicious" but you can't say "Southern dish is delicious" because the latter is not correct English, so it will not be in Duo's list of correct answers i.e. you can't just replace "food" with "dish" here. Also I suspect the you have put in "really" and Duo has not included that in the list of correct answers - possibly because "really delicious" is 真好吃.