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: ENT
Sphenoidal sinus drains into ? 
Select and explain. 
A. Superior meatus, B. Inferior meatus, C. Middle meatus, D. Sphenoethmoidal recess
D: Sphenoethmoidal recess
Answer: D: Sphenoethmoidal recess 
Explanation: Ans. is 'd' i.e., Sphenoethmoidal recess Pa of lateral nasal wall Openings Inferior Nasolacrimal duct Middle Frontal sinus, Maxillary sinus, Anterior ethmoidal sinus Superior Posterior ethmoidal sinus Sphenoethmoidal recess Sphenoid sinus