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': "Method to modify the child's behaviour by the presentation or withdrawal of certain reinforcers is known as: \nSelect and explain. \nA. Contingency management., B. HOME., C. Physical restraint., D. Retraining.", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]