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: Ophthalmology
[{'content': 'Not a feature of orbital apex syndrome \nSelect and explain. \nA. Ophthalmoplegia, B. Amaurosis, C. Anaesthesia of ophthamic nerve, D. Enophthalmos', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A, b, c are triad of orbital apex syndrome.', 'role': 'assistant'}]