28796
Cytochrome P450 2D6 ( CYP2D6 ) is a pivotal enzyme responsible for a major drug oxidation polymorphism in human populations .
 None
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:  
Answer:
 None