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': 'Blow out orbit is characterized by: \nSelect and explain. \nA. Diplopia, B. "Tear drop: sign, C. Forced duction test, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. Diplopia; B i.e. Tear drop sign; C i.e. Forced duction test Blow out fracture is fracture of orbital floor or medial wall Q. It presents with emphysema of lid, subconjunctival ecchymosis, diplopia & forced duction test Q (due to entrapment of muscle), epistaxis, proptosis, enopthalmos & parasthesia in distribution of inferior alveolar nerve. X ray shows tear drop or hanging drop sign Q', 'role': 'assistant'}]