This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy and Physiology of Nose and PNS, Subject name: ENT
[{'content': 'The sphenoethmoidal recess has opening of - \nSelect and explain. \nA. Maxillary sinus, B. Bullaethmoidalis, C. Ethmoid sinus, D. Sphenoid sinus', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Sphenoid sinus Part of lateral nasal wallOpeningsInferiorNasolacrimal ductMiddleFrontal sinus, Maxillary sinus, Anterior ethmoidal sinusSuperiorPosterior ethmoidal sinusSphenoethmoidal recessSphenoid sinus", 'role': 'assistant'}]