111654
Others , like the " d20 System " , use character classes to define most character concepts , but allow some freedom with the statistics within those classes .
 d20 System
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:
 d20 System