22084
EROD activity induction in peripheral blood lymphocytes , liver and brain tissues of rats orally exposed to polycyclic aromatic hydrocarbons .
 Chemical: polycyclic aromatic hydrocarbons
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: polycyclic aromatic hydrocarbons 
Answer:
 Chemical: polycyclic aromatic hydrocarbons