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In 1928 , Paul Dirac found an equation that was fully compatible with special relativity , and ( as a consequence ) made the wave function a 4-component " Dirac spinor " including " up " and " down " spin components , with both positive and " negative " energy ( or matter and antimatter ) .
 person: Paul Dirac; person: Dirac
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: Paul Dirac, Dirac 
Answer:
 person: Paul Dirac; person: Dirac