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
Vertical crest in the fundus of the internal auditory canal is k/a - 
Select and explain. 
A. Bill's bar, B. Ponticulus, C. Cog, D. Falciform crest
A: Bill's bar
Answer: A: Bill's bar 
Explanation: The internal acoustic canal is divided by transverse crest (or Falciform crest) into a superior and inferior part. The superior part is divided by vertical crest or Bill's bar into anterior and posterior parts.