This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': 'Middle ethmoidal sinus is supplied by \nSelect and explain. \nA. Anterior ethmoidal nerve and vessels, B. Middle ethmoidal nerve and vessels, C. Posterior ethmoidal nerve and vessels, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Middle ethmoidal sinus:\n→ Made up of 1 to 7 air cells.\n→ Opens into middle meatus of nose.\n→ Supplied by -\n\nAnterior ethmoidal nerve and vessels.\nOrbital branches of pterygopalatine ganglion.\n\n→ Lymphatic drainage - Submandibular nodes.', 'role': 'assistant'}]