84447
Most probably the practice of masking is much older – the earliest known anthropomorphic artwork is circa 30,000 – 40,000 years old – but insofar as it involved the use of war-paint , leather , vegetative material , or wooden masks , the masks probably have not been preserved ( they are visible only in paleolithic cave drawings , of which dozens have been preserved ) .
 paleolithic
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:
 paleolithic