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': "The 'V' principle of growth is best illustrated by the \nSelect and explain. \nA. Body of Mandible, B. Mandibular ramus, C. Mandibular syrnphysis, D. Spheno-occipital synchondrosis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]