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': "The principle that 'the stimulus must be altered to elicit\na change in the response' is applied in \nSelect and explain. \nA. Reinforcement, B. Aversive Conditioning, C. Retraining, D. Modeling", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]