7577
In 1937 it introduced what became known as the Apex band , consisting of 75 broadcasting frequencies from 41.02 to 43.98 " MHz .
 organization: Apex
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: Apex 
Answer:
 organization: Apex