154584
The school was a county school by 1946 when the town of Preston Hollow was annexed to the city of Dallas and Walnut Hill became part of the DISD .
 location: Preston Hollow; location: Dallas; organization: Walnut
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Preston Hollow, Dallas, Walnut 
Answer:
 location: Preston Hollow; location: Dallas; organization: Walnut