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: ENT
[{'content': 'Vestibular Evoked Myogenic Potential (VEMP) detects lesion of - \nSelect and explain. \nA. Cochlear Nerve, B. Superior Vestibular Nerve, C. Inferior Vestibular Nerve, D. Inflammatory Myopathy', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vestibular Evoked Myogenic Potentials\n\nThe vestibular evoked myogenic potential (VEMP) are short latency electro myograms that are evoked by acostic stimuli in high intensity and recorded from surface electrodes over the tonically contracted sternocleido mastoid muscle.\nThe origin of VEMP is the saccule.\nThe response pathway consists of:\n\n– Saccule; Inferior Vestibular Nerve, Lateral Vestibular Nucleus, Lateral Vestibulospinal Tract and Sternocleidomastoid muscle.\n\nThe test provides diagnostic information about saccular and/or inferior vestibular nerve function.\nAn intact middle ear is required for the response quality.\n\nWaveform of the response\nThe VEMP waveform is characterised by a\n\nWave I – positive peak at 13-15 (p13)\nWave II – negative peak at 21-24 ms (p23)\n\nPeak to peak amplitude of p13-23 is measured and asymmetries between the right and left side is noted (by calculating asymmetry ratio AR)\nAbnormal AR is seen a case of:\n\nSaccular hydrops (AR > 36%)\nVestibular schwannoma orignating from inferior vestibular nerve.\nVestibular neuronitis\nSuperior canal dehiscence syndrome.', 'role': 'assistant'}]