This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Channelopathies and Neuropathies, Subject name: Medicine
[{'content': 'Which of the following is not a test for the integrity of 9th nerve? \nSelect and explain. \nA. Gag reflex, B. Palate symmetry, C. Taste, D. Tongue protrusion', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Testingof 9th Nerve: Testing the gag reflex using a wooden spatula Asking the patient to swallow or cough Evaluating for speech impediments. Test the posterior one-third of the tongue with bitter and sour substances to evaluate for impairment of taste', 'role': 'assistant'}]