This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: AIIMS 2017, Subject name: ENT
Which of the following marked arrow represent lateral semicircular canal during coical mastoidectomy: 
Select and explain. 
A. A, B. B, C. C, D. D
C: C
Answer: C: C 
Explanation: A - Incus, B - Facial nerve, C - lateral semicircular canal, D - Chorda tympani.