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Technical advances in the development of achromatic lenses increased the resolving power of the microscope and around 1839 , Matthias Jakob Schleiden and Theodor Schwann identified that cells were the fundamental unit of organization of all living things .
 person: Matthias Jakob Schleiden; person: Theodor Schwann
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: Matthias Jakob Schleiden, Theodor Schwann 
Answer:
 person: Matthias Jakob Schleiden; person: Theodor Schwann