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Pretreatment with type - 2 serotonin antagonists may be clinically useful in attenuating opiate - induced rigidity , although further studies will be necessary to assess the interaction of possibly enhanced CNS , cardiovascular , and respiratory depression .
 Chemical: serotonin; Disease: rigidity; Disease: cardiovascular , and respiratory depression
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: serotonin; Disease: rigidity; Disease: cardiovascular , and respiratory depression