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Fenfluramine ( 2 mg / kg , i . p . ) produced greater anxiogenic effects in adult rats in both the light / dark and elevated plus maze tests for anxiety - like behavior , and stimulated greater increases in extracellular serotonin in the adult medial prefrontal cortex ( mPFC ) ( 1 , 2 . 5 , and 10 mg / kg , i . p . ) .
 Chemical: Fenfluramine; 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: Fenfluramine; Chemical: serotonin