120920
The reef was historically one of the largest oyster beds in the world and provided a staple for the diet of all classes of citizens both locally and regionally until the end of the 19th century , when the beds succumbed to pollution .
 oyster
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:
 oyster