88847
As an example , in the chromatography of an extract of green plant material ( for example spinach ) shown in 7 stages of development , Carotene elutes quickly and is only visible until step 2 .
 spinach
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:
 spinach