This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Which of the following aren't included in the WHO classification of operating dental auxiliaries? 
Select and explain. 
A. Dental hygienist, B. School dental nurses, C. Therapists, D. Denturists
D: Denturists
Answer: D: Denturists 
Explanation: Non-operating auxiliaries

Dental surgery assistant
Dental secretary/receptionist
Dental laboratory technician
Dental health educator

Operating auxiliaries

School dental nurse
Dental therapist
Dental hygienist
Expanded function dental auxiliaries

Essentials of preventive and community dentistry 
Soben Peter 
5th edition