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': 'All are true regarding superior laryngeal nerve block, except: \nSelect and explain. \nA. Needle pierces through thyrohyoid membrane, B. Sensory loss below level of vocal cords occurs, C. Internal laryngeal nerve is anesthetized, D. Thyroid notch is used as a landmark', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Superior laryngeal nerve supplies sensory supply to the mucosa of larynx upto the level but not including the vocal cords. Sensory supply of vocal cords and larynx below vocal cords is by recurrent laryngeal nerve. Thus in superior laryngeal nerve block, sensory supply below the level of vocal cords will be maintained.', 'role': 'assistant'}]