6722
The most profound effect of pH on binding affinity was observed for polyphenol extracts rich in phenolic acids .
 Chemical: polyphenol; Chemical: phenolic acids
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: polyphenol, phenolic acids 
Answer:
 Chemical: polyphenol; Chemical: phenolic acids