4918
Cytochrome P450 ( P450 ) - derived arachidonic acid ( AA ) metabolites serve pivotal physiological roles .
 Chemical: arachidonic acid
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: arachidonic acid 
Answer:
 Chemical: arachidonic acid