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
Which of the following structures is inferior to spheno petrosal Synchondrosis - 
Select and explain. 
A. Abducens nerve, B. Osseous part of auditory tube, C. Cartilaginous part of auditory tube, D. Petro squamous sinus
C: Cartilaginous part of auditory tube
Answer: C: Cartilaginous part of auditory tube 
Explanation: o Lateral part of inferior surface of petrous part of temporal articulates with greater wing of sphenoid (spheno-petrosal synchondrosis) to form sulcus tubae for the ludgement of cartilaginous part of auditory tube.