113570
Since pre-modern societies , by modern standards , were characterized by a very low degree of urbanization and a large majority of people working in the agricultural sector , economic historians prefer to express income in cereal units .
 plant: cereal
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: cereal 
Answer:
 plant: cereal