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The current Ambassador of Guyana to Russia is Laleshwar Singh , resident in London and whom presented his Letters of Credence to Russian President Boris Yeltsin on 20 June 1995 .
 organization: Guyana; person: Laleshwar Singh; location: London; person: Boris Yeltsin
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: Guyana, Laleshwar Singh, London, Boris Yeltsin 
Answer:
 organization: Guyana; person: Laleshwar Singh; location: London; person: Boris Yeltsin