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Although the process of fermentation was not fully understood until Louis Pasteur 's work in 1857 , it is still the first use of biotechnology to convert a food source into another form .
 person: Louis Pasteur
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Louis Pasteur