This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and paranasal sinuses, Subject name: ENT
[{'content': 'Teardrop sign is seen in \nSelect and explain. \nA. Fracture of zygomatic arch, B. Fracture of maxilla, C. Fracture of mandible, D. Blow out fracture', 'role': 'user'}, {'content': "Answer: D \nExplanation: In 'blowout fractures' or fractures of orbital floor, x-ray shows a convex opacity bulging into the antrum from above. This occurs because of the herniation of orbital contents into the antrum. This sign is known as teardrop sign or teardrop opacity. Ref: Textbook of diseases of ENT; PL Dhingra, 7th edition, pg no. 206", 'role': 'assistant'}]