59530
To address this fact , Gentzen in 1935 proposed his sequent calculus , though he initially intended it as a technical device for clarifying the consistency of predicate logic .
 person: Gentzen
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: Gentzen 
Answer:
 person: Gentzen