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': 'Growth estimation is done by: \nSelect and explain. \nA. Frontal bone, B. Cervical vertebrae, C. Capitate, D. Clavicle', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]