You will be given a definition of a task first, then some input of the task.
From the given sentence, extract the phrase (often noun or verb) that carries the given relationship. The generated phrase should be present in the sentence.

Given Relationship: 'be city in', Sentence: 'Some of the major and most popular cities and towns in South Dakota are : Sioux Falls , Rapid City , Aberdeen , Watertown , Brookings , Mitchell , Pierre , Yankton , Huron and Vermilion .'
Output:
cities