8936
It was refined and used in the 20th century largely as a result of the polio epidemic that struck the world in the 1940 s .
 disease: epidemic
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: epidemic 
Answer:
 disease: epidemic