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
[{'content': '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: \nSelect and explain. \nA. Operant conditioning., B. Classical conditioning., C. Social learning theory., D. Hierarchy of needs.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]