58419
The route from acetic acid to acetic anhydride via ketene was developed by Wacker Chemie in 1922 , when the demand for acetic anhydride increased due to the production of cellulose acetate .
 organization: Wacker Chemie
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Wacker Chemie 
Answer:
 organization: Wacker Chemie