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': 'Tear drop sign" is seen on Waters view in: \nSelect and explain. \nA. Blow out fracture, B. Maxillary mucocele, C. Nasolacrimal duct blockage, D. Fibrous dysplasia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Blow out fracture', 'role': 'assistant'}]