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
Individual response is changed as a result of reinforcement or extinction of previous responses. Hence, a satisfactory outcome will diminish in frequency, this is known as: 
Select and explain. 
A. Operant conditioning., B. Classical conditioning., C. Social learning theory., D. Hierarchy of needs.
A: Operant conditioning.
Answer: A: Operant conditioning. 
Explanation: None