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Robert Lipka ( born 1946 ) is a former army clerk at the National Security Agency ( NSA ) who , in 1997 , pled guilty to conspiracy to commit espionage and was sentenced to 18 years in prison .
 person: Lipka; organization: National Security Agency
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: Lipka, National Security Agency 
Answer:
 person: Lipka; organization: National Security Agency