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: Radiology
[{'content': 'An anatomic structure which has a worm-hole radiolucency is characteristic of \nSelect and explain. \nA. Maxillary sinus, B. Mandibular canal, C. Nutrient canal, D. Mental foramen', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]