This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Facial Nerve And Its Disorders, Subject name: ENT
[{'content': 'Surgical markings for finding the facial nerve is are- \nSelect and explain. \nA. Tympano - mastoid suture, B. Tragal pointer, C. Posterior belly of digastric, D. All the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: After getting feedback on this question, we have changed answer from A => D. If you think A is the only correct answer let us know. Ans. is 'a' i.e., Tympano-mastoid suture o Surgical landmarks to identify main trunk of the facial nerve are as follows:Tympano mastoid suture line - it is located between the mastoid and the tympanic bones. The main facial trunk lies 6 -8 mm distal to the end of the suture.Tragal pointer - the main nerve trunk lies 1[?]0 to 1[?]5 cm deep and slightly anterior and inferior to the tip of the external ear canal cartilage.Posterior belly of digastric -the main nerve trunk lies 1 cm deep to the medial attachment of the posterior belly of digastric muscle to the digastric groove (mastoid notch) of the mastoid bone.Mastoid bone - main nerve trunk is identified inside the mastoid bone by mastoidectomy.", 'role': 'assistant'}]