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Louis Pasteur observed , " if we could intervene in the antagonism observed between some bacteria , it would offer perhaps the greatest hopes for therapeutics " .
 person: Louis Pasteur
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: Louis Pasteur 
Answer:
 person: Louis Pasteur