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During World War II , he joined the Royal Artillery , rising to become a major by the end of the conflict , and working closely with Dwight D. Eisenhower .
 organization: Royal Artillery; person: Dwight D. Eisenhower
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: Royal Artillery, Dwight D. Eisenhower 
Answer:
 organization: Royal Artillery; person: Dwight D. Eisenhower