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: Surgery
[{'content': 'Extra-oral landmark for Gowgates technique of mandibular nerve block \nSelect and explain. \nA. Corner of the mouth, B. Intertragic notch, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]