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': "Indication of desensitization is/are: \nSelect and explain. \nA. Child's initial visit., B. At subsequent appointments, when introducing dental procedures which are new to the patient., C. When treating referral patients., D. All of the above.", 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]