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': 'Mucocelr is commonly seen in sinus: \nSelect and explain. \nA. Frontal, B. Maxillary, C. Ethmoid, D. Sphenoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: A mucocele is an epithelial lined,mucus containing sac completely filling the sinus and capable of expansion: Mucocele are most commonly formed in frontal sinus followed by Ethmoid,sphenoid and maxillary sinuses. Mucocele of frontal sinus presents as a swelking in the floor of frontal sinus above the inner canthus.Itbdisplaces the eyeball forward,downward and laterally. Ref Dhingra 6/e,p 198;Tuli 1/e,p 196.', 'role': 'assistant'}]