4050
The terror threat to Britain has been raised from substantial to severe , Home Secretary Theresa May has announced .
 location: Britain; person: Theresa May
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: Britain, Theresa May 
Answer:
 location: Britain; person: Theresa May