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': 'In anxious parent calls you that her 4-month-old child has still no teeth in his mouth then you should: \nSelect and explain. \nA. Call and do radiographic survey, B. Tell her that it is normal at this age, C. Child has retarded growth, D. Systemic problem', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]