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In 1990 she was the first member of the royal family to make an official visit to the Soviet Union when she went there as a guest of President Mikhail Gorbachev and his government .
 location: Soviet Union; person: Mikhail Gorbachev
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Soviet Union; person: Mikhail Gorbachev