7537
Upon mixing the enzyme with the substrate and exposure to oxygen ( as when a potato or apple is cut and left out ) , the colorless catechol oxidizes to reddish-brown melanoid pigments , derivatives of benzoquinone .
 food: potato; food: apple
Please list all entity words in the text that fit the category.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} 
Answer:
 food: potato; food: apple