This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Ear, Subject name: Anatomy
Middle ear cavity is connected anteriorly to: 
Select and explain. 
A. Nasal cavity, B. Nasopharynx, C. Mastoid antrum, D. Mastoid air cells
B: Nasopharynx
Answer: B: Nasopharynx 
Explanation: Ans: B (Nasopharynx) Ref: Grays Anatomy 40th EdExplanation:Middle ear cavityAnterior wall - Upper canal for tensor tympan muscle & lower canal for auditory tube which communicates to the nasopharynxPosterior wall communicates the mastoid antrum through aditusLateral wall seperates the middle ear from external earMedial wall separates the middle ear from internal ear