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': 'A 9 year old male patient reports with a retrognathic mandible and lip trap. The dentist is doubtful if he should start myofunctional appliance therapy for the child. Which of the following clinical test will help him make his decision? \nSelect and explain. \nA. VTO, B. Kinesiographic registration, C. Rakosi-Jarabak analysis, D. Postural rest position', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Visual Treatment Objective (VTO)\nThis examination helps us decide whether any functional appliance that postures the mandible forward will improve the facial profile and appearance.\xa0\nThe child is asked to bring the lower jaw forward in a state of normal or near normal overjet to evaluate improvement in facial profile. A case with normal maxilla and small mandible may show instant improvement in facial profile.\xa0\nIt helps in predicting treatment changes that would occur in the future for the patient.\nThe accuracy of prediction is a combination of the effect of treatment procedures and accuracy of predicting future growth.', 'role': 'assistant'}]