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': 'All are basic types of operant conditioning described by Skinner, except: \nSelect and explain. \nA. Positive reinforcement., B. Negative reinforcement., C. Omission., D. Extinction.', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The four basic types of operant conditioning described by Skinner are;\na) Positive reinforcement\nb) Negative reinforcement\nc) Omission\nd) Punishment', 'role': 'assistant'}]