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: ENT
Surgical markings for finding the facial nerve is/are 
Select and explain. 
A. Tympano-mastoid suture, B. Tragal pointer, C. Posterior belly of digastric, D. All of the above
A: Tympano-mastoid suture
Answer: A: Tympano-mastoid suture 
Explanation: Facial nerve runs behind this suture in the veical or mastoid segment. Ref: Dhingra 6th edition pg. 91