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: Surgery
[{'content': 'Campbell line is seen in X-ray of following projection \nSelect and explain. \nA. Transcranial, B. Transorbital, C. Transpharyngeal, D. Occipitomental', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]