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His unpalatable observational evidence was only accepted when seemingly unrelated work by Louis Pasteur in Paris some two decades later offered a theoretical explanation for Semmelweis 's observations : the germ theory of disease .
 person: Louis Pasteur; person: Semmelweis
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, Semmelweis 
Answer:
 person: Louis Pasteur; person: Semmelweis