599
On the 13th day , antinociceptive effects were assessed using a model of inflammatory nociception , pain - induced functional impairment model , and the charcoal meal test was used to evaluate the intestinal transit .
 pain, charcoal
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 pain, charcoal