1902
Pain was less severe in Groups R4 and R6 than in the control and R2 groups ( P < 0 . 001 ) .
 Disease: Pain
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
 Entities: Pain 
Answer:
 Disease: Pain