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 mandibular 3rd molar region, the grains of bone run in: \nSelect and explain. \nA. Buccolingual direction, B. Vertical direction, C. Anteroposterior direction, D. Oblique direction', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]