This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
[{'content': 'Antral sign is seen in \nSelect and explain. \nA. Juvenile angiofibroma, B. Otosclerosis, C. CSOM, D. Sinusitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Anterior bowing of the posterior wall of maxillary sinus often called antral sign or Holman-Miller sign, which is pathognomic of angiofibroma. (Ref: Diseases of ear, nose and throat, PL Dhingra, 7th edition, page 281)', 'role': 'assistant'}]