101984
Genetic analysis suggests that the human body louse , which lives in clothing , may only have diverged from the head louse some 170,000 years ago , which supports evidence that humans began wearing clothing at around this time .
 body louse, head louse
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:
 body louse, head louse