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In the 19th century , first potato and buckwheat were introduced as fillings , and later also rice and millet .
 food: potato; plant: buckwheat; plant: rice; plant: millet
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: potato, buckwheat, rice, millet 
Answer:
 food: potato; plant: buckwheat; plant: rice; plant: millet