This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Facial Nerve And Its Disorders, Subject name: ENT
[{'content': 'The aetiology of anterior ethmoidal neuralgia is: \nSelect and explain. \nA. Inferior turbinate pressing on the nasal septum, B. Middle turbinate pressing on the nasal septum, C. Superior turbinate pressing on the nasal septum, D. Causing obstruction of sphenoid opening', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Anterior ethmoidal nerve is a branch of nasociliary nerve (from ophthalmic division of CN V). It is distributed to anterior part of nasal septum and lateral nasal wall. Mucosal contact between nasal septum and middle turbinate causes headache. This headache can be relieved when mucosal surfaces are separated with application of a nasal decongestant such as xylometazoline or adrenaline and a local anaesthetic like lignocaine - a diagnostic test in these cases. Permanent treatment would be to surgically remove structural deformities, e.g. removal of spur or deflected septum and/or reduction of the size of turbinate.', 'role': 'assistant'}]