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The introduction of atypical antipsychotics such as risperidone , olanzapine and clozapine has obviated this problem , but none of the current drugs seem to improve the cognitive deficits accompanying schizophrenia .
 Chemical: risperidone; Chemical: olanzapine; Chemical: clozapine
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: olanzapine; Chemical: clozapine