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" Turtles All the Way Down " is also the title of a 2017 novel by John Green about a teenage girl with obsessive–compulsive disorder .
 Turtles All the Way Down, John Green, obsessive–compulsive disorder
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:
 Turtles All the Way Down, John Green, obsessive–compulsive disorder