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': 'Soft tissue profile of a thumbsucking patient is \nSelect and explain. \nA. convex, B. concave, C. normal, D. anterior divergent', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]