1002
In more severe cases the combination of risperidone and a selective serotonin reuptake inhibitor should be given .
 Chemical: risperidone; Chemical: serotonin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: risperidone; Chemical: serotonin