19360
Also in 1937 , Manfred von Ardenne pioneered the scanning electron microscope .
 person: Manfred von Ardenne
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: Manfred von Ardenne 
Answer:
 person: Manfred von Ardenne