8128
Results showed that the chlorophyll a content of free and immobilized S . capricornutum was not affected by PAHs but was significantly inhibited by heavy metals .
 Chemical: chlorophyll a; Chemical: PAHs
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: chlorophyll a, PAHs 
Answer:
 Chemical: chlorophyll a; Chemical: PAHs