This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2019, Subject name: ENT
[{'content': 'Most prominent and larger air cell of ethmoidal sinus? \nSelect and explain. \nA. Agger nasi cell, B. Haller cell, C. Onodi cell, D. Bulla ethmoidalis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bulla Ethmoidalis: Most prominent and the largest anterior ethmoidal cell. It is located posterior to the frontal recess and enclosed laterally by the lamina papyracea. It forms the roof of the middle meatus. Agger Nasi: most anterior ethmoidal cell. Haller cell: infra orbital ethmoidal cell. Onodi cell: laterally placed posterior most ethmoidal cell.', 'role': 'assistant'}]