200931
( Masterpieces of the State Tretyakov Gallery , Red Square Publishers , ISBN 978-5-900743-36-3 ) On 25 September 1980 , the Soviet Union issued a 6 kopek postage stamp commemorating the 150th anniversary of his birth ( together with that of Nikolai Nevrev ) .
 location: Soviet Union; person: Nikolai Nevrev
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: Soviet Union, Nikolai Nevrev 
Answer:
 location: Soviet Union; person: Nikolai Nevrev