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An aeronautic engineer , Abril joined the Union of the Democratic Centre ( UCD ) which formed the Spanish government from 1977 to 1982 .
 Abril, Union of the Democratic Centre
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Abril, Union of the Democratic Centre