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
All are basic types of operant conditioning described by Skinner, except: 
Select and explain. 
A. Positive reinforcement., B. Negative reinforcement., C. Omission., D. Extinction.
D: Extinction.
Answer: D: Extinction. 
Explanation: The four basic types of operant conditioning described by Skinner are;
a) Positive reinforcement
b) Negative reinforcement
c) Omission
d) Punishment