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: Psychiatry
[{'content': 'Child not eating vegetables. His mother stas giving a chocolate each time he finishes vegetables in the diet. The condition is \nSelect and explain. \nA. Operant conditioning, B. Classical conditioning, C. Social training, D. Negative reinforcement', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Operant conditioning', 'role': 'assistant'}]