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The luffa " sponge " , also spelled " loofah " , which is commonly sold for use in the kitchen or the shower , is not derived from an animal but mainly from the fibrous " skeleton " of the sponge gourd ( " Luffa aegyptiaca " , Cucurbitaceae ) .
 luffa, sponge gourd
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 luffa, sponge gourd